Diversity

Diversity patent applications listed are from June 2005 to current and include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.

11/22/07 - 20070268983 - Method and apparatus for space division multiple access receiver
Methods and systems consistent with this invention receive a plurality of transmitted signals in a receiver having a plurality of receive elements, wherein each transmitted signal has a different spatial location. Such methods and systems receive the plurality of transmitted signals at the plurality of receive elements to form a ...

11/22/07 - 20070268982 - Frequency hopping of pilot tones
Presented are systems and methods for selecting a subband for a pilot tone in a communication system and transmitting and receiving data units that include pilot tones. In one embodiment, a method is presented comprising determining a channel parameter and selecting a subband for the pilot tone based upon the ...

11/15/07 - 20070263744 - Systems and methods for interference cancellation in a multiple antenna radio receiver system
Interference cancellation is implemented for a multiple antenna system. The multiple antenna receiver is provided that includes a whitening filter coupled to receive processed signals corresponding to signals received at respective antennas, and to generate whitened signals corresponding to each of the received signals, having a colored noise component whitened. ...

11/15/07 - 20070263743 - Method for allocating data and pilots, and transmitting method and device and receiving method and device using the same in orthogonal frequency division multiple access system
Disclosed is a method for allocating data and pilots, a transmitting method and device, a receiving method and device in an OFDMA system. A terminal partitions subcarrier groups and symbols from an uplink channel based on a basic pilot pattern generated by a specific reference, receives at least one subchannel ...

11/08/07 - 20070258541 - Wireless communication system, wireless communication apparatus and wireless communication method
A wireless communication system which performs data transmission from a first terminal including N antennas to a second terminal including M antennas using spatially multiplexed streams (N and M are integers larger than or equal to 2 and N<M) is disclosed. The system includes training request means, training means, channel ...

11/08/07 - 20070258539 - Wireless cmmunication system with diversity/mimo array branch decoupling
A method and device for determining decoupled signal parameters of received signals associated with individual antenna elements of an antenna array is disclosed. The method comprises the steps of determining a receiving characteristic of the antenna array, establishing an identity characteristic associated with the antenna array, the identity characteristic independently ...

11/08/07 - 20070258538 - Multiple input, multiple output communications systems
Embodiments of the present invention include systems and methods for optimizing the transmitter and receiver weights of a MIMO system. In one embodiment, the weights are optimized to create and steer beam nulls, such that each transmitted signal is substantially decoupled from all other signals between a MIMO transmitter a ...

11/08/07 - 20070258537 - Method of determining at least one transmit mode parameter for a multiple-input multiple-output system
In an embodiment of the method, at least one signal-to-interference-and-noise ratio (SINR) for each antenna configuration in a set of transmission antenna configurations is determined based on an estimated channel characteristic. At least one received signal characteristic is determined for each antenna configuration in the set of antenna configurations based ...

11/08/07 - 20070258536 - Method and system for reordered qrv-lst (layered space time) detection for efficient processing for multiple input multiple output (mimo) communication systems
Aspects of a method and system for reordered QRV-LST (layered space time) detection for efficient processing for multiple input multiple output (MIMO) communication systems are presented. The method may include receiving an ordered plurality of signals wherein each of the ordered plurality of received signals comprises information contained in an ...

11/01/07 - 20070253508 - Apparatus and method for selecting effective channel in a multi-user mimo system
An apparatus and method for selecting an effective channel in a multi-user MIMO system are provided, in which a receiver receives pilot signals from a transmitter, determines channel information indicating an antenna offering the best quality among a plurality of antennas using the pilot signals, and generates feedback information with ...

11/01/07 - 20070253507 - Self-adaptive mimo transmission/reception system and method
A self-adaptive multiple-input multiple-output (MIMO) transmission/reception system includes a transmitter provided with a serial-to-parallel converter, channel encoders, a plurality of constellation mappers, and transmission power controllers, and a receiver provided with a transmission scheme selection device, a zero forcing/minimum mean square error (ZF/MMSE) detector, reception power controllers, constellation demappers, channel ...

11/01/07 - 20070253506 - Cdma transmission apparatus and cdma transmission method
A control section (110) recognizes the type of data included in a transmission signal and outputs a control signal (C1) to an S/P conversion section (101) and a spreading control section (107). The S/P conversion section (101) apportions a specific type of data output from the control section (110) to ...

10/18/07 - 20070242770 - Feedback of channel state information for mimo and subband scheduling in a wireless communication system
Techniques for efficiently sending channel state information using differential encoding are described. Differential encoding may be performed across space, across frequency; across space and frequency, across space, frequency and time, or across some other combination of dimensions. In one design, spatial state information may be determined for multiple spatial channels ...

10/11/07 - 20070237254 - Configuring a device for wireless communication
A method of configuring a device for a wireless communication, the method comprising the steps of: selecting a first combination of resources in relation to a first wireless communication in a first area involving a first device, and selecting one or more other combination(s) of resources in relation to one ...

10/04/07 - 20070230609 - Iterative detection and decoding apparatus and method in mimo system
An iterative detection and decoding method in a Multiple Input Multiple Output (MIMO) system includes detecting entire MIMO nodes to generate soft decision values; decoding a first soft decision value among the soft decision values; determining whether to perform an iterative detection and decoding by measuring reliability of the decoded ...

10/04/07 - 20070230608 - Method and apparatus for quasi maximum likelihood mimo detection
Techniques for MIMO detection that has performance approaching that of a maximum likelihood (ML) algorithm while having a reduced computational complexity are described. One method of an embodiment decomposes a MIMO channel into a 2×2 system. QR decomposition and maximum likelihood detection may be performed on the 2×2 system. Thereafter, ...

09/27/07 - 20070223619 - Apparatus and method for feeding back information on channel state for scheduling in multiple antenna system
An apparatus and method for controlling amount of information to be fed back in a multiple antenna system in a multi-user environment. The apparatus includes a channel estimator which estimates channel values by using an input signal; a Singular Value Decomposition (SVD) operator which decomposes singular values from the estimated ...

09/27/07 - 20070223618 - Apparatus and method for transmitting/receiving signal in a communication system using multiple input multiple output scheme
An apparatus for transmitting a signal in a Multiple Input Multiple Output (MIMO) communication system includes determining transmission antennas to be used by a signal transmission apparatus depending on channel quality information received from a reception apparatus, encoding an input information data stream into a codeword using a coding scheme, ...

09/27/07 - 20070223616 - Radio communication apparatus and radio communication system
A radio communication apparatus that can more precisely grasp, in a case of using a plurality of antenna elements to receive radio signals, the reception qualities of the respective antenna elements to improve the error rate of received signals. In the apparatus, a lower-order bit likelihood extracting part (107) extracts, ...

09/27/07 - 20070223615 - Transceiver interface architecture
A transceiver interface architecture where the same RF transceiver can be used in wireless devices that support any number of standards, with or without receive diversity implementation. Each input port of the RF transceiver can be shared by a number of input signals, which effectively expands the number of available ...

09/27/07 - 20070223614 - Common time frequency radio resource in wireless communication systems
A wireless communication network (100) wherein a network entity assigns one or more symbol vectors to each of a plurality of communication entities in the network for substantially simultaneous communication on a common time frequency radio resource also assigned to the plurality of communication entities. The vectors assigned to the ...

09/20/07 - 20070217539 - Method of transmitting data and estimating channel information in ofdm/ofdma mobile communications system
A method of feeding back channel information in an OFDM or OFDMA radio communications system is disclosed, in which a transmitting side instructs a region for measuring a downlink channel status and in which a receiving side feeds back the channel information to the transmitting side. The present invention includes ...

09/20/07 - 20070217538 - Systems and methods for improving performance of multiple spatial communication channels
Embodiments include systems and methods for improving performance of multiple spatial communications channels. Embodiments comprise power loading a steering matrix to achieve improved performance. ...

09/20/07 - 20070217537 - Minimum error rate lattice space time codes for wireless communication
A lattice space time coding arrangement for transmission systems is disclosed which enables construction of lattice space time codes with improved error rate performance for arbitrary receiver structures. ...

09/13/07 - 20070211816 - Apparatus and method for transmitting and receiving signals in a multi-antenna system
An apparatus and method for transmitting and receiving a data stream in a multi-antenna system, in which a plurality of data streams are received, a plurality of code symbol sequences are generated by precoding the plurality of data streams, the code symbol sequences being mapped to the transmit antennas in ...

09/13/07 - 20070211815 - Method and apparatus for scaling soft bits for decoding
A method and apparatus for scaling a soft bit for decoding in a wireless communication system are described. A scaling factor is calculated for a received symbol based on an estimated signal-to-noise ratio (SNR) of the received symbol and the scaling factor is applied to a soft bit of the ...

09/13/07 - 20070211814 - Data transmission with spatial spreading in a mimo communication system
For data transmission with spatial spreading, a transmitting entity (1) encodes and modulates each data packet to obtain a corresponding data symbol block, (2) multiplexes data symbol blocks onto NS data symbol streams for transmission on NS transmission channels of a MIMO channel, (3) spatially spreads the NS data symbol ...

09/13/07 - 20070211813 - Mimo precoding in the presence of co-channel interference
Methods and systems for communicating in a wireless network include mitigating co-channel interference (CCI) for precoded multiple-input multiple-output (MIMO) systems and incorporating the effect of CCI mitigation on channel characteristics in the design of channel state information (CSI) feedback mechanisms. Various embodiments and variants are also disclosed. ...

09/06/07 - 20070206699 - Adaptive space-time coding and modulation method and transmitter
Embodiments of the present invention provides an adaptive space-time coding and modulation method and a transmitter. In one embodiment, the method includes: obtaining a curve corresponding to a modulation mode, a channel coding rate, a coding mode of a space-time code, a parameter indicating signal transmission quality and SNR by ...

09/06/07 - 20070206698 - Transmission/reception apparatus and method for supporting mimo technology in a forward link of a high rate packet data system
An apparatus and method for allocating dedicated pilots for supporting MIMO and setting MIMO-only interlace slots in a CDMA 2000 Nx-EV-DO compatible system. The method includes determining whether a current interlace is a particular interlace in which a Multiple Input Multiple Output (MIMO) signal for channel estimation in a receiver ...

09/06/07 - 20070206697 - Signal receiving method and signal receiving equipment for multiple input multiple output wireless communication system
In a multiple input/multiple output wireless communication system, a receiving signal is compensated based on a wireless channel state information matrix converted by lattice reduction. The distortion of the modulation constellation diagram of a signal is considered, a detection signal is processed, and an intermediate signal table containing at least ...

09/06/07 - 20070206696 - Method and system for an adaptive vblast receiver for wireless multiple input multiple output (mimo) detection
Various aspects of a system for an adaptive VBLAST receiver for wireless MIMO detection may comprise utilizing log likelihood ratios (LLR) to selectively cancel interference in a received signal when information contained in one or more layers is encoded. Following the selective cancellation of interference, further computations may be performed ...

09/06/07 - 20070206695 - Selecting mcs in a mimo system
An accurate total error rate performance can be measured using a computed error vector magnitude (EVM) per stream. Using this EVM, the receiver or the transmitter can advantageously generate an optimized modulation and coding scheme (MCS) that corresponds to a specific number of streams, modulation and coding rate for the ...

09/06/07 - 20070206694 - Modifying a signal according to a diversity parameter adjustment
A signal is modified according to a current diversity parameter adjustment, and is transmitted from a modifying communication device to a feedback communication device. A feedback signal reflecting feedback information describing the signal as received by the feedback communication device is received. The feedback signal comprises frames, and a frame ...

08/30/07 - 20070201577 - Apparatus and method for signal reception in multiple input multiple output (mimo) communication system
A method for signal reception in a Multiple-Input-Multiple-Output (MIMO) communication system is provided. The method enhances the efficiency of signal reception in the MIMO system and simplifies the algorithms of signal reception and soft decoding metrics generation. In other words, soft decisions are generated according to correlations between metrics corresponding ...

08/30/07 - 20070201576 - Method and system for transmitting/receiving data in a communication system
Provided are a system and a method for transmitting/receiving data in a communication system. The method includes calculating a processing matrix of a transmission unit for transmitting data, a processing matrix of a reception unit for receiving the data, a channel matrix formed by a plurality of transmission antennas and ...

08/23/07 - 20070195907 - Method of transmitting and receiving data using superposition modulation in a wireless communication system
A method of transmitting and receiving data using superposition modulation in a wireless communication system having multiple antennas is disclosed. More specifically, the method comprises encoding the at least one inputted data stream by a channel coding scheme, puncturing the at least one inputted coded data stream into at least ...

08/23/07 - 20070195906 - Method and apparatus for pilot multiplexing in a wireless communication system
Techniques for multiplexing pilots in a wireless transmission are described. In one aspect, a transmitter station generates multiple pilot sequences for multiple transmit antennas, with each pilot sequence comprising pilot symbols sent in the time domain on a different set of subcarriers. The transmitter station further generates multiple pilot transmissions ...

08/16/07 - 20070189409 - Diversity transmitter and diversity transmission method
The present invention concerns a diversity transmitter, comprising: transmit symbol input means (1) for inputting a symbol matrix (b) to be forwarded to a transmit processing means (2), said transmit processing means comprising supplying means (2a) for supplying columns of said symbol to a plurality of at least two branches, ...

08/16/07 - 20070189408 - Mobile station and method for channel sounding using a single radio frequency transmitter chain in a multiple-input multiple-output (mimo) system
Embodiments of a mobile station and a method for channel sounding in a wireless network are generally described herein. Other embodiments may be described and claimed. In some embodiments, channel sounding is performed using a single radio frequency transmitter chain in a multiple-input multiple-output (MIMO) system. In some embodiments, portions ...

08/09/07 - 20070183529 - Selecting modulation and coding level and spatial rate for orthogonal frequency domain modulation systems
Embodiments are directed to a link adaptation method that selects the optimum transmission scheme and modulation and coding signal (MCS) level within a MIMO system, based on optimal maximum throughput on the channels. The method selects the MCS levels and spatial rate values for broadband communication systems based on the ...

08/09/07 - 20070183528 - Space-time codes for linearly labelled pam, psk, qam and related constellations using gray mapping
General algebraic space-time code constructions are presented for Gray-mapped 2K-PSK, 2K-PAM, and 4K-QAM constellations. The space-time codes achieve the rate-diversity tradeoff—i.e., they allow the transmission of information at the maximum rate possible for the given signaling constellation and the achieved transmit diversity level. New codes created by applying a nonsingular ...

08/09/07 - 20070183527 - Space-time transmit diversity systems and methods for ofdm applications
Embodiments of the invention provide orthogonal Frequency Division Multiplexing-Space-time Block Codes (OFDMSTBC) mappings for code rate 1, 2 and 4 codes for 4 Transmit Antennas. To overcome the innate weakness of known codes, a new class of STBC codes is provided which is particularly suited for OFDM applications, although other ...

08/02/07 - 20070177688 - System and method employing linear dispersion over space, time and frequency
Systems and methods for performing space time coding are provided. Two vector→matrix encoding operations are performed in sequence to produce a three dimensional result containing a respective symbol for each of a plurality of frequencies, for each of a plurality of transmit durations, and for each of a plurality of ...

07/19/07 - 20070165739 - High rate transmission diversity transmission and reception
The performance and symbol rate in a wireless mobile system are increased by forming a transmission code matrix using transformed orthogonal codes, in such a way that the code is robust to channel statistics and operates well in both Ricean and (correlated) Rayleigh channels. Furthermore, the invention enables high symbol ...

07/19/07 - 20070165738 - Method and apparatus for pre-coding for a mimo system
Systems and methodologies are described that facilitates computing a precoding index which correlates to a precoding matrix within a codebook. According to various aspects, systems and/or methods are described that facilitate computing an effective signal-to-noise ratio (SNR). Such systems and/or methods may further facilitate selecting a precoding matrix and a ...

07/19/07 - 20070165736 - Method and apparatus for selecting a beam combination in a mimo wireless communication system
A method and apparatus for selecting a beam combination of beam switched antennas in a multiple-input multiple-output (MIMO) wireless communication system including a first node and a second node. The first node sends a plurality of modulation and coding scheme (MCS) requests to the second node. Each of the plurality ...

07/19/07 - 20070165735 - Method and apparatus for supporting transmit diversity in a receiver
A method and apparatus for supporting transmit diversity are disclosed. A wireless communication system includes a transmitter having a plurality of transmit antennas and a receiver having at least one receive antenna. The transmitter transmits different pilot code sequences via each of the transmit antennas. The receiver comprises at least ...

07/12/07 - 20070160162 - Method and system for transmitting data in a communication system
A method and system are provided for transmitting data in a multiple-input multiple-output (MIMO) communication system. A receiver sets the number of sub-streams of each column of a preceding matrix with respect to all precoding matrices of channels formed between the receiver and a transmitter and measures channel states with ...

07/12/07 - 20070160161 - Transmitter apparatus, receiver apparatus, and wireless communication method
When space-time block code signals (103, 104) are to be transmitted, the patterns thereof are changed in accordance with data to be transmitted. This advantageously allows a good-quality data transmission to be achieved by the space-time block code signals (103, 104). In addition, since data can be transmitted by use ...

07/12/07 - 20070160160 - Wireless communication system, wireless communication apparatus, and resource assignment method used therein
In a transmitting portion of a wireless communication apparatus, hopping pattern generating portions 16 and 17 produce hopping patterns independent from each other and specific to a transmitter. Subcarrier assigning portions 18 and 19 assign transmission symbol sequences to subcarriers 1 to R in accordance with the hopping patterns and ...

07/05/07 - 20070153935 - Method and device for cancelling interference in wireless communication system
The present invention provides a transmitter having multiple transmitting antennas, comprising: SM/STC apparatus for performing spatial multiplexing or space-time coding diversity on data and for causing resulting signals to be transmitted parallel by multiple transmitting antennas; and a controller for controlling the SM/STC apparatus to operate in SM mode or ...

07/05/07 - 20070153934 - Constant uneven power loading in beamforming systems for high throughput wireless communications
An apparatus and method for closed-loop signaling over multiple channels in a telecommunication system, wherein a power loading method using constant uneven power loading under the power sum constraint is utilized. The detection of power loadings at the receiver is not necessary, which simplifies the receiver design. Nor is there ...

06/28/07 - 20070147538 - Apparatus and method for canceling interference from neighbor cells in broadband communication system
An apparatus and method for canceling an interference signal in a broadband wireless communication system are provided. A receiver of a wireless communication system includes at least two receive antennas for receiving a target signal of a serving base station and interference signals of at least one neighbor base station; ...

06/28/07 - 20070147537 - Apparatus and method for calibration in a communication system
In a calibration apparatus in a communication system, a modulation unit calculates a reference signal by modulating a downlink signal, and a digital Intermediate Frequency (IF) unit converts the reference signal to an intermediate frequency signal. An up-converter converts the intermediate frequency signal to a Radio Frequency (RF) signal, and ...

06/28/07 - 20070147536 - Wireless communication device employing interference-sensitive mode selection and associated methods
Embodiments of a wireless communication system employing interference-sensitive mode selection and associated methods are generally introduced. ...

06/28/07 - 20070147535 - Method for rate adaptation with extended mcs set for wideband eigen-beamforming transmission
A method for rate adaptation with extended MCS set for wideband eigen-beamforming transmission. A signaling method over multiple channels in a wireless telecommunication system including a transmitter and a receiver, performs the steps of obtaining an information bit stream, selecting the number of transmission streams, selecting different transmission rates for ...

06/28/07 - 20070147534 - Method and system for power loading implementation detection in beamforming systems
A method of detecting the power loadings at a receiver wherein estimation of power loadings based on the received reference signals is unnecessary. Channel condition is obtained for each channel and transmission power loading per channel is detected according to channel condition, wherein estimation of power loadings based on the ...

06/28/07 - 20070147533 - Method and system for aggregate channel estimation for frequency-selective transmit beamforming
A system (10) and method (50) of operating a wireless communication system between a transmit device (12) employing an array of transmit antennas and a receiver (15) can include transmitting (52) a beamformed signal with antenna weights computed based on knowledge of a plurality of channels forming an aggregate channel ...

06/28/07 - 20070147532 - Method and system for injecting sub-synchronization signals
A method and system of communicating sub-synchronization information into a transmitted digital audio stream and extracting sub-synchronization information from a received digital audio stream is provided. The method includes the steps of having a transmitter introduce sub-synchronization information into a data stream at a period less than that of existing ...

06/21/07 - 20070140374 - Spatio-temporal processing for communication
A space-time signal processing system with advantageously reduced complexity. The system may take advantage of multiple transmitter antenna elements and/or multiple receiver antenna elements, or multiple polarizations of a single transmitter antenna element and/or single receiver antenna element. The system is not restricted to wireless contexts and may exploit any ...

06/21/07 - 20070140373 - Constellation rearrangement for transmit diversity schemes
A method of transmitting data in a wireless communication system from a transmitter to a receiver, comprising the steps of modulating data at the transmitter using a first signal constellation pattern to obtaing a first data symbol. The first data symbol is transmitteds to the receiver using a first diversity ...

06/21/07 - 20070140372 - Method and system for utilizing space-time codes for block fading channels
A communication system for transmitting encoded signals over a communication channel is disclosed. The system includes a transmitter, which has a source that is configured to output a message signal, and an encoder that is configured to generate a code word in response to the message signal. The code word ...

06/21/07 - 20070140371 - Combining space time block code (stbc) with spatial multiplexing for mimo transmission
A STBC-based transmission method and transmission system provides equal protection on all data streams such that all streams operate at the same SNR. STBC and spatial multiplexing are combined in a transmitter which provides equal STBC coding protection on all data streams. Such a combination of STBC with spatial multiplexing ...

06/21/07 - 20070140370 - Receiver and method for decoding a coded signal with the aid of a space-time coding matrix
The disclosure relates to a method for decoding a received signal comprising symbols which are distributed in space and time with the aid of a space-time coding matrix, comprising a space-time decoding stage and at least two iterations, each of which comprising the following sub-stages: diversity pre-decoding, the opposite of ...

06/14/07 - 20070133709 - Apparatus and method for iterative detection and decoding (idd) in multi-antenna communication system
An Iterafive Detection and Decoding (IDD) receiving apparatus and method in a multiple input multiple output (MIMO) communication system. The IDD receiving apparatus includes an MIMO detector which generates soft decision values of coded bits by MIMO-decoding a receive vector, feedback priori information, and a list of candidate coded symbol ...

06/14/07 - 20070133708 - Method and apparatus for allocating transmission power in communication system with multiple antennas
In a method for allocating transmission power in a communication system including multiple antennas, a plurality of subcarriers are grouped by a plurality of groups, and each group includes at least one subcarrier. A transmission power weight and an antenna transmission vector are calculated for each group by using channel ...

06/14/07 - 20070133707 - Apparatus and method for determining transmit/receive antenna in communication system using multiple antennas
Disclosed are an apparatus and a method for determining a transmit/receive antenna in a Multiple Input Multiple Output (MIMO) communication system. At least one sub-channel matrix including transmit antenna information and receive antenna information is generated. From the at least one sub-channel matrix, a sub-channel matrix having a maximum value ...

06/07/07 - 20070127589 - Log-likelihood ration (llr) generating apparatus and method in mimo antenna communication system
A Log-Likelihood Ratio (LLR) generating apparatus and method in a communication system using a spatial multiplexing scheme. The reception method includes acquiring at least one estimated transmit vector by demodulating a receive vector using at least one Multiple Input Multiple Output (MIMO) detection process; selecting one of the at least ...

06/07/07 - 20070127588 - Method and apparatus for channel and noise estimation
Techniques for performing channel and noise estimation for a MIMO transmission sent from multiple transmit antennas to multiple receive antennas are described. Samples are obtained from the receive antennas. For a first scheme, channel estimates are derived by correlating the samples with at least one pilot sequence, and signal, noise ...

06/07/07 - 20070127587 - Interleaver design for ieee 802.11n standard
A MIMO wireless system includes a transmitter having a parser that parses a bit stream into multiple spatial data streams and multiple interleavers corresponding to the multiple spatial data streams, where each interleaver interleaves the bits in the corresponding spatial data stream by performing multiple column rotations and row rotation, ...

06/07/07 - 20070127586 - Multiple stream co-phasing for multiple-input-multiple-output (mimo) systems
A system and method for transmitting multiple independent data streams from subsets of a plurality of radio antennas. The method includes determining by the receiver, an antenna partitioning, including relative phase rotations to be applied to each antenna, that results in the highest channel capacity among the possible partitionings. The ...

05/31/07 - 20070121753 - Wireless communications apparatus
In a lattice-reduction-aided receiver based wireless communications system, soft estimates of transmitted bit values are determined from a received signal by applying lattice reduction to the channel estimate and equalising the received signal in accordance with the reduced basis channel, and determining probabilities of transmitted bits having particular values by ...

05/31/07 - 20070121752 - Wireless communication apparatus
In a wireless receiving apparatus, comprising a plurality of antennas and a plurality of receivers each of which is provided for each antenna, each receiver uses a received signal that was received by the receiving antenna that is connected to it, and received signals that were received by the other ...

05/31/07 - 20070121751 - Methods and apparatus for beamforming training symbols in wireless multiple-input-multiple-output systems
Embodiments of methods and apparatus for beamforming training symbols in wireless multiple-input-multiple-output systems are generally described herein. Other embodiments may be described and claimed. ...

05/31/07 - 20070121750 - Data transmission method and data reception method
In a transfer apparatus to which MIMO-OFDM is applied, a data transmission method and a data reception method are provided in which, even when there are frequency errors varying among transfer paths, the precision of estimation of an inverse propagation coefficient function can be improved, thereby making it possible to ...

05/31/07 - 20070121749 - Method for pre-filtering training sequences in a radiocommunication system
A training sequence is pre-filtered in a radiocommunication system having an emitter in the form of an antenna device with several antenna systems, thereby making it possible to transmit the training sequences through a pre-filter to said antenna systems side for reradiation by the emitter. Estimation enabling to form the ...

05/17/07 - 20070110180 - Configurable bit interleaving
An integrated circuit radio transceiver and method therefor is operable to flexibly and efficiently interleave a digital bit stream arranged in a table characterized by N rows and N columns further including interleaving column and row bits in the table and frequency rotating interleaved bits in one interleaving step by ...

05/17/07 - 20070110179 - Transmitter diversity technique for wireless communications
A simple block coding arrangement is created with symbols transmitted over a plurality of transmit channels, in connection with coding that comprises only of simple arithmetic operations, such as negation and conjugation. The diversity created by the transmitter utilizes space diversity and either time or frequency diversity. Space diversity is ...

05/10/07 - 20070104288 - Method and system for utilizing givens rotation expressions for asymmetric beamforming matrices in explicit feedback information
Aspects of a method and system for utilizing Givens rotation expressions for asymmetric beamforming matrices in explicit feedback information are presented. In one aspect of the invention, Givens matrices may be utilized to reduce a quantity of information communicated in explicit feedback information via an uplink RF channel. The explicit ...

05/10/07 - 20070104287 - Mimo-cdma wireless communication equipment and method for pre-verifying thereof
A MIMO-CDMA wireless communication equipment has a transmitter and a receiver. The transmitter has an encoder for receiving and encoding a plurality of data, and sending the data to a quadrature phase-shift keying (QPSK) unit. The QPSK unit conducts QPSK modulating to an output of the encoder and sends it ...

05/10/07 - 20070104286 - Equipment and method for mimo sc-fed communication system
Equipment for a MIMO differential SC-FED communication system that includes a transmitter and a receiver is provided. The transmitter has a differential block encoder module for receiving a plurality of data block pairs and performing a circular convolution operation on the data blocks to produce a plurality of coded data ...

05/10/07 - 20070104285 - Digital wireless audio transmitter system employing time diversity
A transmitter system that transfers digital data on a fixed frequency channel of a radio frequency band in the presence of interference from at least one FHSS interference source includes a time diversity generation circuit. The time diversity circuit compacts a duration of data frames then replicate the time compressed ...

05/03/07 - 20070098106 - Quantized multi-rank beamforming with structured codebook for multiple-antenna systems
A quantized multi-rank beamforming technique that is adapted based on feedback from a receiver containing information that captures the existence of multiple transmission modes of the channel between the transmitter and receiver. The modes of the channel can be represented by a set of orthonormal eigenvectors. Rank selection chooses the ...

05/03/07 - 20070098105 - Nxn multiple-input multiple-output transceiver
An N×N multiple-input multiple-output (MIMO) transceiver is provided. The transceiver includes a plurality of transceivers, each including at least one transceiver circuit; an oscillation unit which is configured to generate a differential signal which is supplied to the at least one transceiver circuit; a plurality of buffers, which are mounted ...

05/03/07 - 20070098104 - Method and system to maintain shapes of temporal pulses in wireless broadband signals transmitted through a dispersive antenna
A radio frequency system for broadband wireless communication including one or more dispersive antennae operable to transmit and receive wireless broadband signals having a wide range of frequencies and one or more equalizers each in communication with a respective dispersive antenna and each operable to distort the broadband signals to ...

05/03/07 - 20070098103 - Receiving apparatus and transmitting apparatus
A partial bit demodulation section (550) that demodulates partial bits among a plurality of bits that form 1 symbol of each modulated signal using a detection method different from likelihood detection, signal point reduction sections (514 and 516) that reduce the number of candidate signal points using demodulated partial bits, ...

04/26/07 - 20070092020 - Radio communication method and system, and receiver apparatus and transmitter apparatus
There are provided: a channel estimation means which obtains channel estimation values between the transmitter antennas and the receiver antennas from received signals received by the receiver antennas; a memory for storing therein the reception signals and the channel estimation values obtained by said channel estimation means; and a signal ...

04/26/07 - 20070092019 - Beamforming for non-collaborative, space division multiple access systems
A wireless communication system noncollaborative, multiple input, multiple output (MIMO) space division multiple access (SDMA) system determines subscriber station combining and weighting vectors that yield a high average signal-to-interference plus noise ratio (SINR). Each subscriber station independently transmits information to a base station that allows the base station to determine ...

04/19/07 - 20070086541 - Apparatus and method for processing llr for error correction code in a mobile communication system
An apparatus and method for scaling an LLR for an error correction code in a mobile communication system are provided. In the LLR scaling apparatus, an environment factor controller decides an environment factor according to a radio channel environment. A scaling factor generator generates a scaling factor using the environment ...

04/19/07 - 20070086540 - Apparatus and method for transmitting/receiving data in multi-user multi-antenna communication system
Provided is an apparatus and method for transmitting/receiving data in a multi-user multi-antenna communication system. A data transmitting apparatus and method computes a RX filter or a TX filter for each user receiver in an improved scheme, selects a codebook correlating with the computed TX filter or the computed RX ...

04/19/07 - 20070086539 - High-performance ldpc coding for digital communications in a multiple-input, multiple-output environment
Transceiver circuitry for use in a multiple-input, multiple-output (MIMO), orthogonal frequency-division multiplexing (OFDM), communications environment, is disclosed. Error correction coding according to a fixed-block size code, such as low density parity check (LDPC) coding, is implemented. A specific LDPC code with excellent error rate performance is disclosed. ...

04/19/07 - 20070086538 - Method of designing interleavers for multiple-encoder mimo ofdm systems
An improved interleaver design to fully explore the diversity of the MIMO OFDM systems provides higher diversity gain than usual. A method for wireless data communication using such interleaver design implements parsing a bit stream into multiple spatial data streams, interleaving the bits in each spatial data stream by performing ...

04/12/07 - 20070081608 - Method for increasing accuracy for estimating mimo channel
The present invention relates to a method for increasing accuracy for estimating a multiple input multiple output (MIMO) channel. In the method, a maximum delay spread of a channel is estimated by using a Gold code or a Kasami code, a loosely-synchronous (LS) code having an appropriate interference free window ...

04/12/07 - 20070081607 - Performing a scan of diversity parameter differences
Modifying a signal according to a diversity parameter adjustment includes accessing scan parameter values, where a scan parameter describes a scan process. The scan parameter values include diversity parameter vectors, where a diversity parameter vector has a diversity parameter value for each of one or more diversity parameters. The scan ...

04/12/07 - 20070081606 - Multiple-input multiple-output communication system
Radio stations (10, 20) include a variety of propagation models. A radio signal is transmitted from a first to a second radio station, and the received signal is fitted to a plurality of models. Alternatively, the correlation of the received signals is fitted to models. The received signals are processed ...

04/05/07 - 20070076812 - Technique to provide proprietary mimo format in a product and ability to support a new standard when the new standard is developed
A technique to provide proprietary MIMO format in a product and ability to support a new standard when the new standard is developed for wireless communication in a MIMO system. A product may include a “hook” to allow for the protection of existing proprietary MIMO mode of operation, once a ...

04/05/07 - 20070076811 - Channel estimation for orthogonal preambles in a mimo system
A general architecture scheme to perform channel estimation on orthogonal transmissions for any number of transmitting antennas present. Generally, the channel estimation is applicable for wireless communications in a MIMO system. ...

03/29/07 - 20070071127 - Method and apparatus for pilot communication in a multi-antenna wireless communication system
Systems and methodologies are described that facilitate improved pilot information to MIMO user devices without increasing interference of SISO user devices in a wireless communication environment. A data communication signal can be generated and transmitted at a first power level, and a continuous pilot waveform comprising pilot information related to ...

03/29/07 - 20070071126 - Reconfigurable orthogonal frequency division multiplexing (ofdm) chip supporting single weight diversity
A method and system for a reconfigurable orthogonal frequency division multiplexing (OFDM) chip supporting single weight diversity are provided. The reconfigurable OFDM chip may be configured to process signals such as IEEE 802.11, 802.16, and digital video broadcasting (DVB). The OFDM chip may generate channel weights to be applied to ...

03/22/07 - 20070064831 - Iterative detection and decoding for a mimo-ofdm system
Techniques to iteratively detect and decode data transmitted in a wireless (e.g., MIMO-OFDM) communication system. The iterative detection and decoding is performed by iteratively passing soft (multi-bit) “a priori” information between a detector and a decoder. The detector receives modulation symbols, performs a detection function that is complementary to the ...

03/22/07 - 20070064830 - Apparatus and method for extending number of antennas in a wireless communication system using multiple antennas
An apparatus and method for simultaneously providing service to users each having a different number of antennas in a multiple-antenna wireless communication system are provided. The communication method discloses a BS in a wireless communication system that services a first multiple antenna mode using X transmit antennas and a second ...

03/22/07 - 20070064829 - Method and system for a simplified user group selection scheme with finite-rate channel state information feedback for fdd multiuser mimo downlink transmission
Certain embodiments of the invention may be found in a method and system for a simplified user group selection scheme with finite-rate channel state information feedback for frequency division duplex (FDD) multiuser multiple-input-multiple-output (MIMO) downlink transmission. Aspects of the method may include selecting, from a plurality of users, a first ...

03/22/07 - 20070064828 - Method and system for multiple input multiple output (mimo) channel estimation
Various aspects of a method for and system for multiple input multiple output (MIMO) channel estimation are presented. Aspects of a method for computing channel estimates in a radio frequency (RF) communications system may comprise decomposing a direct matrix computation into a plurality of constituent matrices, and jointly computing a ...

03/15/07 - 20070058746 - Method for transmitting symbols through at least a communication channel
The present invention concerns a method for transmitting symbols through at least a channel in a telecommunication system including at least one transmitter (10) provided with at least two transmitting antennas (Antt 1, Antt 2) and at least one receiver provided with at least one receiving antenna (Antr 1), the ...

03/08/07 - 20070053461 - Receiving method and receiving apparatus, and communication system utilizing the same
A timing synchronization detects a temporary timing in a manner such that the presence of a first known signal in the received packet signal is detected by performing correlation processing on the first known signal in the received packet signal. The timing synchronization detects a timing in a manner that ...

03/08/07 - 20070053460 - Coding in a mimo communication system
A method of receiving information includes receiving a vector of signal values for a transmitted codeword in antennas of a MIMO receiver array in each of a sequence of time slots. Each vector forms one row of a matrix Y. Each antenna receives the signal values of one column of ...

03/01/07 - 20070047666 - Preamble formats supporting high-throughput mimo wlan and auto-detection
A method for generating a preamble of an Orthogonal Frequency Division Multiplexed (OFDM) data frame for a multiple input multiple output (MIMO) wireless communication includes determining at least one system condition preamble format parameter. When the system condition preamble format parameter satisfies a first preamble format parameter a preamble having ...

02/22/07 - 20070041467 - Signal detection method for mimo communication system employing spatial multiplexing
Disclosed is a signal detection method for a receiver of a Multiple-Input Multiple-Output (MIMO) communication system having nT and nR (where nR is greater than or equal to nT) transmission and reception antennas, respectively, and an nT×nR channel matrix. The signal detection method includes selecting a plurality of sub-channel matrices ...

02/22/07 - 20070041466 - Antenna virtualization in communication systems
Communication systems and methods are described in which multiple transmit signals are generated from an input stream or signal. The communication systems and methods, collectively referred to as antenna virtualization or virtual antenna systems, generate from each input stream multiple transmit signals that when driven into multiple antennas create a ...

02/22/07 - 20070041465 - Antenna virtualization in communication systems
Communication systems and methods are described in which multiple transmit signals are generated from an input stream or signal. The communication systems and methods, collectively referred to as antenna virtualization or virtual antenna systems, generate from each input stream multiple transmit signals that when driven into multiple antennas create a ...

02/22/07 - 20070041464 - Selective virtual antenna transmission
Techniques for transmitting data from virtual antennas instead of physical antennas are described. Each virtual antenna may be mapped to some or all physical antennas by a different mapping. The performance of different sets of at least one virtual antenna is evaluated based on one or more metrics such as ...

02/22/07 - 20070041463 - Superimposed training for multiple antenna communications
A training-based transmission technique for multiple-antenna communication systems is disclosed herein where the transmitted symbols are a superposition of the training symbols and the data symbols. ...

02/15/07 - 20070036236 - Interference canceling matched filter (icmf) and related methods
An interference cancelling matched filter (ICMF) may include an antenna array for receiving a signal burst including a training sequence therein, and an adaptive space-time filter connected to the virtual antenna array and having settable filter coefficients. The ICMF may further include a channel impulse response estimator for estimating a ...

02/08/07 - 20070030919 - Channel estimation for wireless systems with multiple transmit antennas
In various embodiments, techniques are provided to determine channel characteristics of various communication systems such as OFDM systems or systems using a plurality of transmit antennas by using various sets of training symbols. ...

02/08/07 - 20070030918 - Secure communication method, transmission apparatus and reception apparatus
A transmitting apparatus that transmits signals from a plurality of antennas, and can improve the security of communication compared with a conventional system. In this apparatus, an antenna changing section (105) stores an antenna change pattern in internal memory, and each time a clock signal is input, generates an antenna ...

02/01/07 - 20070025464 - System and method for spatial-multiplexed tropospheric scatter communications
A method is described comprising: transmitting a training signal from each antenna of a base station to each of a plurality of client devices utilizing tropospheric scatter, each of the client devices analyzing each training signal to generate channel characterization data, and transmitting the channel characterization data back to the ...

02/01/07 - 20070025463 - Bit parser for interleaver in transmitter with multiple transmit antennas
A transmitter having two or more transmit antennas includes a bit parser for providing two or more data streams to an interleaver of the transmitter. The bit parser receives bits representing data to be transmitted over the transmit antennas, and parses the bits into a number of data streams equal ...

01/18/07 - 20070014378 - System and method for mimo equalization for dsp transceivers
A method to efficiently deal with FEXT crosstalk in wireline communication system via MIMO equalization is presented. A MIMO-DFE based receiver architecture is developed to demonstrate the advantage over the traditional receiver design. A MIMO structure for systems with TH precoding is also developed for 10GBASE-T application. The proposed architecture ...

01/18/07 - 20070014377 - Data communication with embedded pilot information for timely channel estimation
Pilot data and data-bearer data are formed to be mutually orthogonal and in each other's null-space. Data to be transmitted is first modulated with the data-bearer matrix and then pilot data is added thereto. The pilot data may be added to each modulated symbol, thereby increasing significantly the density of ...

01/11/07 - 20070009059 - Efficient computation of spatial filter matrices for steering transmit diversity in a mimo communication system
Techniques for efficiently computing spatial filter matrices are described. The channel response matrices for a MIMO channel may be highly correlated if the channel is relatively static over a range of transmission spans. In this case, an initial spatial filter matrix may be derived based on one channel response matrix, ...

01/11/07 - 20070009058 - Method for transmitting data in a mimo communication system
Provided is a multiple-input multiple-output (MIMO) data transmission method. A transmitter generates a transmission symbol by adding a parity symbol to a predetermined number of data symbols, generates a preprocessed symbol by multiplying the predetermined number of transmission symbols by a preprocessing matrix in units of blocks, selects a transmission ...

01/04/07 - 20070002963 - Apparatus, method and computer program product providing closed loop transmit antenna operation for systems using multiple antennas
A method includes determining weights corresponding to each of a plurality of antennas used to transmit data signals, each weight suitable to modify a corresponding one of the data signals prior to transmission using a corresponding one of the antennas; and transmitting information corresponding to at least one of the ...

01/04/07 - 20070002962 - Space-time and/or space-frequency block coding using complex signal swapping
A method of space-time and/or space-frequency block encoding begins by receiving at least two complex signals, wherein each of the at least two complex signals includes a real component and an imaginary component. The method continues, for each of the at least two complex signals, by generating a swapped complex ...

01/04/07 - 20070002961 - System and method of communicating signals
A communication system is presented. The system includes one or more transmitters configured to transmit a signal, where each of the signals generated by the one or more transmitters corresponds to a respective frequency. Further, the system includes a plurality of receiver front-ends configured to receive the signal transmitted by ...

12/28/06 - 20060291582 - Method and apparatus for processing data for transmission in a multi-channel communication system using selective channel inversion
Techniques to process data for transmission over multiple transmission channels. The available transmission channels are segregated into one or more groups, and the channels in each group are selected for use for data transmission. Data for each group is coded and modulated based on a particular coding and modulation scheme ...

12/28/06 - 20060291581 - High data rate closed loop mimo scheme combining transmit diversity and data multiplexing
Closed loop multiple-antenna wireless communications system with antenna weights determined by maximizing a composite channel signal-to-interference-plus-noise ratio minimum. Multiplexed symbol streams over subsets of antennas enhance throughput. ...

12/21/06 - 20060285606 - Quantized power control in multiple antenna communication system
A power control design for multiple antenna communication systems is herein disclosed which uses an optimized quantized feedback link between the receiver and the transmitter. ...

12/21/06 - 20060285605 - Coding and modulation for multiple data streams in a communication system
Techniques for transmitting multiple data streams to a single receiver using a single code rate and different modulation schemes are described. Channel estimates are determined for the multiple data streams and used to select a single code rate and multiple modulation schemes for the multiple data streams. The system may ...

12/21/06 - 20060285604 - Wireless communication network with extended coverage range
A wireless communication network supports 802.11b/g and a range extension mode, which supports at least one data rate lower than the lowest data rate in 802.11b/g. A transmitting station (which may be an access point or a user terminal) includes first and second processors. The first processor performs differential modulation ...

12/14/06 - 20060280257 - Method and apparatus for generating weights for transmit diversity in wireless communication
Techniques for generating weights that can provide good performance for transmit diversity are described. A receiver obtains symbols for a data transmission sent from multiple transmit antennas to at least one receive antenna. The receiver also derives channel estimates for a communication channel between the transmit antennas and the receive ...

12/07/06 - 20060274849 - Time-domain transmit and receive processing with channel eigen-mode decomposition for mimo systems
Techniques for processing a data transmission at the transmitter and receiver. In an aspect, a time-domain implementation is provided which uses frequency-domain singular value decomposition and “water-pouring” results to derive time-domain pulse-shaping and beam-steering solutions at the transmitter and receiver. The singular value decomposition is performed at the transmitter to ...

12/07/06 - 20060274848 - Method and system of convolutive coding for the transmission of space-time block codes according to the technique termed golden code
the set Γ∞, termed “infinite Golden Code”, being a principal ideal of the ring Az as defined by the Golden Code technique. ...

12/07/06 - 20060274847 - Training frames for mimo stations
A short sequence of training frames is transmitted from the station A to the station B via the channel in response to receiving the long sequence of training frames. A number of frames in the short training sequence is at least equal to ...

12/07/06 - 20060274846 - Differential multiple-length transmit and reception diversity
The present invention achieves differential transmit diversity and related diversity reception schemes transmit symbol constellations which are extended to multiple levels. Heretofore, a group of transmission bits is divided into a first sub-group of transmission bits and a second sub-group of transmission bits. Then, the first sub-group of transmission bits ...

11/23/06 - 20060262874 - Method and apparatus for power control in a multiple antenna system
A method and apparatus for use in a CDMA-type or OFDM/OFDMA-based multi-antenna system first selects an initial set of antenna weights and multiplies the selected antenna weights by copies of a transmission signal to produce a weighted transmission signal. In an OFDM/OFDMA-based implementation, a selected set of sub-carriers are modulated ...

11/16/06 - 20060256888 - Multi input multi output wireless communication reception method and apparatus
A Multi Input Multi Output (MIMO) Wireless Communication Reception Method and Apparatus are proposed whereby in a 2-way wireless communication system with scattering propagation channels, where several data sub-streams are simultaneously transmitted from a transmitting side to a receiving side, and where no channel information is necessarily available at the ...

11/09/06 - 20060251183 - Method for determining multiple-input multiple-output (mimo) channel coefficient using polarity-inverted training signals in an orthogonal frequency division multiplexed (ofdm) multicarrier system
Embodiments of system and method for determining channel coefficients in a wireless network are generally described herein. Other embodiments may be described and claimed. In some embodiments, channel coefficients of a multiple-input multiple-output (MIMO) channel may be determined without interpolation. ...

11/09/06 - 20060251182 - Data communication system
A communication system (1) comprises a plurality of at least three transmitters (11, 12, 13, 14). A data signal (S) is provided to all transmitters. Each transmitter transmits data signal fragments (31, 32, 33, 34). The data transmissions by the various transmitters are accurately synchronised, such that, on arrival in ...

11/02/06 - 20060245513 - Method and apparatus for singular value decomposition of a channel matrix
A method and apparatus for decomposing a channel matrix in a wireless communication system are disclosed. A channel matrix H is generated for channels between transmit antennas and receive antennas. A Hermitian matrix A=HHH or A=HHH is created. A Jacobi process is cyclically performed on the matrix A to obtain ...

11/02/06 - 20060245512 - Apparatus and method for preventing call failure in an adaptive smart antenna system
A transmitter and transmission method for preventing a call failure using a system power value, caused by rapidly increasing transmit power against a large phase mismatch occurring before a phase mismatch correction cycle elapses in a smart-antenna communication system. In the transmitter and transmission method, if the system power value ...

10/26/06 - 20060239375 - Adaptive modulation in a multiple input multiple output wireless communication system with optional beamforming
A transmitting MIMO wireless device transmits a training sequence to a receiving MIMO wireless device. The receiving MIMO wireless device estimates a channel response based upon the training sequence, determines an estimated transmitter beamforming unitary matrix and a transmit path quality matrix, and then transmits some/all of these parameters to ...

10/26/06 - 20060239374 - Efficient feedback of channel information in a closed loop beamforming wireless communication system
A method for feeding back transmitter beamforming information from a receiving wireless communication device to a transmitting wireless communication device includes a receiving wireless communication device receiving a preamble sequence from the transmitting wireless device. The receiving wireless device estimates a channel response based upon the preamble sequence and then ...

10/26/06 - 20060239373 - Beamforming in a wireless communication with a partial estimation to reduce overhead
A method for beamforming in a wireless communication begins by receiving a baseband signal. The method continues by receiving a feedback signal that includes a subset of angles, wherein a set of angles provide polar coordinates for a unitary matrix and wherein the subset of angles is a subset of ...

10/26/06 - 20060239372 - Reduced feedback for beamforming in a wireless communication
A method for reduced feedback for beamforming in a wireless communication begins by receiving a baseband signal. The method continues by digitally beamforming the baseband signal using a unitary matrix having polar coordinates. ...

10/19/06 - 20060233277 - Method and apparatus for multi-sector transmission in a wireless communication network
According to transmission control as taught herein, a transmission control system is configured for controlling the transmission of data via two or more data streams to a subscriber in a wireless communication network. In one or more embodiments, the transmission control system comprises a first control circuit to evaluate performance ...

10/19/06 - 20060233276 - Spatial modulation in a wireless communications network
A signal (e.g., a UWB signal) is generated that conveys a first information sequence. This generation may employ various modulation techniques, such as OFDM and DSSS. To further convey a second information sequence, this signal is spatially modulated. Then, the signal may be transmitted to a remote device. Accordingly, this ...

10/19/06 - 20060233275 - Distributed transmit diversity in a wireless communication network
A wireless communication network is configured to provide distributed diversity transmissions, wherein different diversity-coded versions of the same information signal are transmitted from each of two or more network sectors. The diversity-coded versions of the information signal are based on space-time or space-frequency codes, and the information signal may comprise ...

10/19/06 - 20060233274 - Method for the multiple-antennae emission of a signal by unitary space-time codes, receiving method, and corresponding signal
An embodiment of the invention relates to a method for sending a signal formed by successive vectors each comprising N symbols to be sent, and implementing at least two transmitter antennas. A distinct sub-matrix is associated with each of said antennas, said sub-matrices being obtained by subdivision of a unitary ...

10/12/06 - 20060227893 - Method and/or system for estimating phase noise error
Embodiments of methods and/or systems for estimating phase error noise are disclosed. ...

10/12/06 - 20060227892 - Interleaver and parser for ofdm mimo systems
A MIMO wireless system includes a transmitter that has a transmitter having a parser that parses a bit stream into multiple spatial data streams and multiple interleavers corresponding to the multiple spatial data streams, where each interleaver interleaves the bits in the corresponding spatial data stream by performing multiple column ...

10/12/06 - 20060227891 - Method of channel estimation for mimo-ofdm using phase rotated low overhead preamble
A low overhead long preamble and the corresponding channel estimator for MIMO-OFDM systems that are backward compatible with current 802.11a systems. The preamble has a first training sequence and a second training sequence, wherein the second training sequence is a phase rotation of the first training sequence. The first training ...

10/05/06 - 20060222101 - Method and apparatus for an adaptive multiple-input multiple-output (mimo) wireless communications systems
An adaptive MIMO communications system includes a multifunctional reconfigurable antenna with a selectively alterable effective physical antenna array configuration and radiation/polarization properties, which configuration and properties is a component in the optimization of the adaptive system parameters. The multifunctional reconfigurable antenna comprises a plurality of antenna components and a plurality ...

10/05/06 - 20060222100 - Multiple band multiple input multiple output transceiver integrated circuit
A MIMO transceiver integrated circuit (IC) includes a plurality of multiple band direct conversion transmitter sections, a plurality of multiple band direct conversion receiver sections, and a local oscillation generation module. Each of the plurality of multiple band direct conversion transmitter sections includes a transmit baseband module and a multiple ...

09/28/06 - 20060215781 - Method for detecting and decoding a signal in a mimo communication system
A method for detecting and decoding a signal in a communication system based on Multiple-Input Multiple-Output (MIMO)-Orthogonal Frequency Division Multiplexing (OFDM). A signal is received through multiple receive antennas. A decision error occurring at a symbol decision time is considered and a symbol is detected from transmitted symbols. Original data ...

09/21/06 - 20060209980 - Beam and power allocation method for mimo communication system
The present invention provides the multiuser Multiple-Input Multiple-Output (MIMO) systems with a feedback method which includes measuring, at the terminal, received Signal to Noise Ratios (SNRs) for all transmit antennas, selecting one of precoding matrixes, which has best SNRs, retrieving an index mapped to the selected preceding matrix from a ...

09/21/06 - 20060209979 - Frequency offset tracking
The present invention relates to estimating and correcting for frequency offset errors in wireless receivers, and is particularly but not exclusively related to MIMO WLAN applications. The present invention provides an improved method of tracking receiver frequency offsets in a receiver for MIMO systems. These receiver based frequency offset components ...

09/21/06 - 20060209978 - Indoor radio transmission method for parallel radio transmission of digital data substreams and a mobile radio transmission system
A radio transmission method and a wireless transmission system comprising multiple transmitter and receiver antennae simultaneously operating within the same frequency range and space-time encoders and decoders. Data transmission and channel matrix measurement can take place synchronously. Characteristic pilot signals that are unequivocally recognizable are superimposed with low noise on ...

09/14/06 - 20060203928 - Apparatus for decoding quasi-orthogonal space-time block codes
An efficient decoding scheme of a receiver in a wireless communication system including a transmitter for encoding data into quasi-orthogonal space-time block codes (STBCs) and transmitting the STBCs through a plurality of transmit antennas using fading channels, and a receiver for receiving data through a plurality of receive antennas. In ...

09/07/06 - 20060198462 - Method for encoding a message using diagonally weighted space-time trellis code depending on bit feedback
Disclosed is a method for encoding messages with space-time trellis codes(STTC) and transmitting the encoded messages in communication system provided with at least two transmit antennas and at least one receive antenna. The method comprising generating a codeword by encoding message using STTC; generating a modified codeword by multiplying the ...

09/07/06 - 20060198461 - Wireless data communication system and wireless data communication method
In MIMO transmission which executes quadrature modulation of M transmission antennas and N reception antennas, a transmission signal vector will be set as a vector having the element number of 2M that comprises the in-phase components and quadrature components of M complex signals, a reception signal vector will be set ...

09/07/06 - 20060198460 - Link adaptation for high throughput multiple antenna wlan systems
A wireless device 148 that performs link adaptation is disclosed. The wireless device 148 comprises at least two antennas 101a, 120a and 101b, 120b, and a network interface logic operable to select transmission parameters based on a packet error rate 154 and on at least one signal to noise ratio ...

09/07/06 - 20060198459 - Nonlinear precoding method for a digital broadcast channel
Several subscriber signals are transmitted simultaneously and at the same frequency by a central transmitter to several decentralized receivers which do not cooperate with each other, by digital message transmission in a broadcast channel. A common transmission signal, which enables an error-free individual reception, should be generated with knowledge of ...

08/31/06 - 20060193396 - Communication system modulating/demodulating data using antenna patterns and associated methods
A wireless communication system includes a transmitter comprising a serial-to-parallel converter for converting serial data bits to a parallel bit stream, a signal mapper coupled to the serial-to-parallel converter and an antenna selector coupled to the serial-to-parallel converter. The signal mapper receives as input a first group of bits from ...

08/24/06 - 20060188036 - Method for transmitting uniformly distributed data in a mimo telecommunication system
sequence allocation ALS for forming groups G1, G2 of Nt permutated bit sequences Psqj intended to be transmitted through Nt channels allocated to a same bit rank for all transmitting antennas. The invention ensures an essentially homogeneous distribution of the encoded data bits over the different channel inputs, and thus ...

08/17/06 - 20060182196 - Method for link adaptation
Systems and methods for optimizing transmission of a plurality of data streams on a multiple-input multiple-output channel are described. The systems and methods for optimizing reduce the multiple-input multiple-output channel for each transmission scheme to an equivalent single-input single-output channel for the transmission scheme and transmit the plurality of data ...

08/17/06 - 20060182195 - Separate fec decoding and iterative diversity reception
Methods, apparatuses, and systems are presented for deriving data from an error correction encoded composite signal involving (a) receiving a composite signal comprising contributions from a plurality of individual signals transmitted over different paths representing a common data sequence encoded using an error correction code, (b) calculating soft values of ...

08/17/06 - 20060182194 - Integrated fec decoding and iterative diversity reception
Methods, apparatuses, and systems are presented for deriving data from an error correction encoded composite signal involving (a) receiving a composite signal comprising contributions from a plurality of individual signals transmitted over different paths representing a common data sequence encoded using an error correction code, (b) calculating soft values of ...

08/17/06 - 20060182193 - Technique for adaptive equalization in band-limited high data rate communication over fading dispersive channels
In high data rate communication applications where digital data information is error-corrected coded and interleaved and transmitted with spectral limitations over fading dispersive channels, a method and receiver is described that incorporates channel estimation and decision-feedback equalization. Channel estimation is accomplished within a receiver time block with locally generated reference ...

08/17/06 - 20060182192 - Wireless communication system, wireless communication apparatus, wireless communication method, and computer program
Disclosed is a wireless communication system which carries out spatial multiplexing communication forming multiple spatial channels between a pair of a transmitter with multiple antennas and a receiver with multiple antennas, having the transmitter and the receiver. In the system, the multiple spatial channels are divided into one or more ...

08/17/06 - 20060182191 - Selection of training sequences for multiple-in multiple-out transmissions
A cellular communication system comprises a Multiple-In Multiple-Out, MIMO, transmitter (101) and receiver (103). The MIMO transmitter (101) comprises a message generator (303) for generating MIMO messages comprising selected training sequences and transceivers (305, 307, 309) transmitting the messages on a plurality of antennas (311, 313, 315). The training sequences ...

08/10/06 - 20060176974 - Radio communications device with adaptive combination
To reduce costs in multiple-input multiple-output (MIMO) and other wireless communication systems an arrangement is described whereby adaptive combination is used at user equipment in order to produce two or more directional antenna beams. Improvements in carrier to interference levels result. ...

08/10/06 - 20060176973 - Vertical adaptive antenna array for a discrete multitone spread spectrum communications system
Two or more antenna elements are arranged in the vertical direction to give vertical spatial adaptivity to a wireless discrete multitone spread spectrum communications system. The system is based on a combination of Discrete Multitone Spread Spectrum (DMT-SS) and multi-element adaptive antenna array technologies. This enables the automatic positioning of ...

08/10/06 - 20060176972 - Method and system for optional closed loop mechanism with adaptive modulations for multiple input multiple output (mimo) wireless local area network (wlan) system
Aspects of a method and system for an optional closed loop mechanism with adaptive modulations for a multiple input multiple output (MIMO) WLAN system are provided. One aspect of the system may comprise a receiver that may select, for a plurality of spatial streams, a modulation type and/or coding rate. ...

08/10/06 - 20060176971 - Multi input multi output wireless communication reception method and apparatus
A Multi Input Multi Output (MIMO) Wireless Communication Reception Method and Apparatus are proposed whereby in a 2-way wireless communication system with scattering propagation channels, where several data sub-streams are simultaneously transmitted from a transmitting side to a receiving side, and where no channel information is necessarily available at the ...

08/10/06 - 20060176970 - Smart antenna solution for mobile handset
A mobile terminal with smart antennas, comprises a plurality of groups of radio frequency signal processing modules (300), for transforming received multi-channel radio frequency signals to multi- channel baseband signals; a smart antenna processing module (306), for smart antenna baseband processing said multi-channel baseband signals output from said plurality of ...

08/03/06 - 20060171483 - Decoder for a multiplexed transmission system
Information is decoded from a signal received from a transmission over a MIMO channel from a plurality of transmit antennas, by means of a decoder and a corresponding decoding method. The signal is received on a plurality of receive antennas, and the information is encoded as a string of symbols ...

08/03/06 - 20060171482 - Initiation of a mimo communication
The present invention provides a method and apparatus for initiating a multiple input multiple output (MIMO) communication. The method and apparatus includes processing that begins by transmitting a frame formatted in accordance with a default MIMO active transmitter-receiver antenna configuration to a target receiver. The processing continues by receiving at ...

08/03/06 - 20060171481 - Method and apparatus for constructing mimo constellations that preserve their geometric shape in fading channels
A method and related system of constructing multidimensional constellations whose shape remains invariant despite multiplicative distortions inherent to fading channels, and which provide a means for introducing coding redundancy to a signal without affecting the spectral efficiency of that signal is provided. Specifically, a method is provided for expanding multidimensional ...

07/27/06 - 20060165192 - Wireless communication system, receiver, demodulation method used for the system and receiver, and program thereof
In a wireless communication system having a receiver which receives, through plural reception antennae, signals transmitted from plural transmission antennae, bit likelihood can be surely calculated without requiring a selection processing. A transmitter has M transmission antennae, and transmits signals through the transmission antennae, respectively. A receiver has N reception ...

07/27/06 - 20060165191 - Mimo channel feedback protocols
Handshaking protocols, techniques, and structures are presented for use in implementing closed loop MIMO using explicit feedback in a wireless network. ...

07/20/06 - 20060159196 - Apparatus and method for channel estimation and cyclic prefix reconstruction in an ofdm-stbc mobile communication system
An apparatus and method for channel estimation and CP reconstruction in an OFDM-STBC mobile communication system are provided. An ISI canceller cancels ISI signal components from first and second received symbol sequences. A cyclicity restorer cancels ICI signal components from the ISI-cancelled first received symbol sequence and the ISI-cancelled second ...

07/20/06 - 20060159195 - Apparatus using concatenations of signal-space codes for jointly encoding across multiple transmit antennas, and employing coordinate interleaving
A system for transmitting data over a MIMO channel has a transmitter and a receiver. In the transmitter, the input data is encoded over at least two pipes by a concatenation of at least two constituent signal-space encoders. Each constituent encoder is used to generate, in response to the input ...

07/20/06 - 20060159194 - Scalable pre-channel estimate phase corrector, method of correction and mimo communication system employing the corrector and method
The present invention provides a pre-channel estimate phase corrector for use with a multiple-input, multiple-output (MIMO) receiver employing M receive antennas, where M is at least two. In one embodiment, the pre-channel estimate phase corrector includes a training sequence coordinator configured to receive a pattern of training sequences from the ...

07/13/06 - 20060153312 - Apparatus and method for space-time frequency block coding in a wireless communication system
A Space-Time-Frequency Block Coding (STFBC) encoding apparatus and method for a wireless communication system are provided. In a transmitter using a plurality of transmit antennas, an encoder encodes an input symbol sequence according to a predetermined space-time coding matrix. An antenna circulator selects one of predetermined permutation matrices according to ...

07/06/06 - 20060146953 - Method and apparatus for estimating transmit weights for multiple antennas
An approach for determining antenna weights in a multiple antenna communication system is provided. The approach jointly optimizes the transmitter weights and the receiver filter. A filter of a receiver (e.g., Linear Minimum Mean Square Error (LMMSE)) is optimized using initial weight values of the transmit antennas. The cost function, ...

07/06/06 - 20060146952 - Scalable post-channel estimate phase corrector, method of correction and mimo communication system empolying the corrector and method
The present invention provides a post-channel estimate phase corrector for use with a multiple-input, multiple-output (MIMO) receiver employing M receive antennas, M being at least two. In one embodiment, the post-channel estimate phase corrector includes a pilot sequence coordinator configured to receive a pattern of pilot sequences from the M ...

07/06/06 - 20060146951 - System and method of processing frequency-diversity coded signals with low sampling rate
A system and method of processing frequency-diversity coded signals with a low sampling rate less than the Nyquist rate for ultra-wideband devices are described. The frequency-diversity coding system comprises a frequency-diversity encoder, one or more first transformation device, a summation device, a signal filter, a sampling device, a second transformation ...

07/06/06 - 20060146950 - Reduced complexity detector for multiple-antenna systems
A reduced-complexity maximum-likelihood detector that provides a high degree of signal detection accuracy while maintaining high processing speeds. A communication system implementing the present invention comprises a plurality of transmit sources operable to transmit a plurality of symbols over a plurality of channels, wherein the detector is operable to receive ...

06/29/06 - 20060140300 - Wireless communication device
A first bit estimate value for a first data stream is determined from a signal y0 received by a first antenna, and a second bit estimate value for the first data stream is determined from a signal y1 received by a second antenna; these are synthesized to determine a synthesized ...

06/22/06 - 20060133531 - Communication system and transmitter-receiver for use therewith
To achieve the optimal power control of a system in an MIMO communication method. When decoding in accordance with a receiving algorithm of the MIMO communication method in plural receivers, each receiver acquires the reception power level of a received signal from a transmitter paired with the receiver, and generates ...

06/22/06 - 20060133530 - Method and apparatus for combining space-frequency block coding, spatial multiplexing and beamforming in a mimo-ofdm system
A method and apparatus for combining space-frequency block coding (SFBC), spatial multiplexing (SM) and beamforming in a multiple-input multiple-output (MIMO) orthogonal frequency division multiplexing (OFDM) system. The system includes a transmitter with a plurality of transmit antennas and a receiver with a plurality of receive antennas. The transmitter generates at ...

06/15/06 - 20060126753 - Apparatus and method for detecting space-time multi-user signal of base station having array antenna
An apparatus and method for detecting a space-time multi-user signal are disclosed. The apparatus includes: an RF/IF processing unit for converting received signals through an array antenna into digital baseband signals; a splitting unit for dividing the digital baseband signals into data signals and reference signals; a estimating unit for ...

06/15/06 - 20060126752 - Method and system for frame formats for mimo channel measurement exchange
A method and system for frame formats for MIMO channel measurement exchange is provided. Aspects of a method for communicating information in a communication system may comprise transmitting data via a plurality of radio frequency (RF) channels utilizing a plurality of transmitting antenna, receiving feedback information via at least one ...

06/08/06 - 20060120478 - Method and apparatus for transmitting/receiving data in a multiple-input multiple-output communication system
A multiple-input multiple-output (MIMO) communication system is provided for communication between a transmission apparatus having a plurality of transmission antennas and a reception apparatus having a plurality of reception antennas. The reception apparatus performs singular value decomposition (SVD) on channel information for a channel established to the transmission apparatus, and ...

06/08/06 - 20060120477 - Cooperative mimo in multicell wireless networks
A method and system for cooperative multiple-input multiple output (MIMO) transmission operations in a multicell wireless network. Under the method, antenna elements from two or more base stations are used to from an augmented MIMO antenna array that is used to transmit and receive MIMO transmissions to and from one ...

06/08/06 - 20060120476 - System and method capable of implicit feedback for the devices with an unequal number of transmitter and receiver chains in a wireless local area network
An embodiment of the present invention provides a wireless station (STA) capable of implicit feedback in a wireless local area network, comprising at least one power amplifier, a plurality of antennas capable of being connected with said at least one power amplifier, and a switch capable of switching the connection ...

06/01/06 - 20060115015 - Transmitter and receiver for use in a relay network, and system and method for performing transmission and reception using the same
An apparatus and method are provided for transmitting high-speed data through a plurality of transmitter antennas using a relay network, receiving signals transmitted from the plurality of transmitter antennas, and removing interference in a mobile communication system. The received signals are despread on a transmitter antenna-by-transmitter antenna basis according to ...

06/01/06 - 20060115014 - Transmitting and receiving apparatus and method for optimizing performance of adaptive modulation and coding in a multiple input and multiple output antenna communication system
A transmitting and receiving apparatus and method for optimizing performance of an adaptive modulation and coding (AMC) in a multiple input and multiple output antenna (MIMO) communication system. When the AMC is applied to the MIMO system, the optimal scheme is different depending on the MIMO channel situation, the maximum ...

05/25/06 - 20060109928 - Wireless system having channel fading compensation using zero-forcing
A MISO wireless LAN includes multiple inputs and a single output. The present invention includes a method and apparatus of compensating for time sensitive or frequency sensitive channel fading using zero forcing. The time sensitive channel fading is represented by the vector [H(t)], and the interference compensation is performed by ...

05/25/06 - 20060109927 - Synchronizer, method of synchronizing signals and mimo transceiver employing the same
The present invention provides a synchronizer for use with a multiple-input, multiple-output (MIMO) transceiver employing multiple individual transceivers. In one embodiment, the synchronizer includes a synthesizing unit coupled to a reference oscillator and configured to generate separately synthesized radio frequency (RF) signals having relative phase differences. Additionally, the synchronizer also ...

05/18/06 - 20060104382 - Method and apparatus for transmitting/receiving signals in multiple input multiple output wireless communication system employing beam forming scheme
Disclosed is a method and an apparatus for transmitting/receiving signals in an multiple input multiple output (MIMO) wireless communication system. The method and apparatus including beam forming of a reference signal while predetermined codes are mapped on a one-to-one basis to each of a plurality of beams available for the ...

05/18/06 - 20060104381 - Beam-steering and beam-forming for wideband mimo/miso systems
Techniques to perform beam-steering and beam-forming to transmit data on a single eigenmode in a wideband multiple-input channel. In one method, a steering vector is obtained for each of a number of subbands. Depending on how the steering vectors are defined, beam-steering or beam-forming can be achieved for each subband. ...

05/18/06 - 20060104380 - Time-switched preamble generation to enhance channel estimation signal-to-noise ratio in mimo communication systems
The present invention provides a channel estimate enhancer for use with a multiple-input, multiple-output (MIMO) transmitter employing N transmit antennas, where N is at least two. In one embodiment, the channel estimate enhancer includes a first preamble generator that produces a basic preamble configured to provide gain training and channel ...

05/18/06 - 20060104379 - Technique to increase a code rate in a mimo system using virtual channels
Various techniques and embodiments are described to increase a code rate in a MIMO system using one or more virtual channels. ...

05/11/06 - 20060098754 - Beam and power allocation method for mimo communication system
A beam and power allocation method for a MIMO system transmitting multiple data streams from a transmitter having a plurality of transmit antennas to a receiver having at least two receive antennas, the transmit antennas being grouped based on feedback information from the receiver, includes obtaining covariance matrices for respective ...

05/04/06 - 20060093062 - Apparatus and method for transmitting and receiving data using space-time block coding
An STFBC coding apparatus for a transmitter with four Tx antennas is provided. In the transmitter, an encoder generates a code symbol vector by encoding an input symbol sequence in a predetermined coding method. A grouping block permutes the elements of the code symbol vector by multiplying the code symbol ...

05/04/06 - 20060093061 - Apparatus and method for transmitting and receiving data using space-time block coding
An space-time-frequency block coding (STFBC) apparatus for a transmitter with four Tx antennas is provided. An input symbol sequence is transmitted through the four Tx antennas in a predetermined method based on feedback information received from a receiver or a selected matrix with regularities, thereby improving the performance of an ...

05/04/06 - 20060093060 - Mimo system and method
There is provided a Multi-Input Multi-Output (MIMO) communication system including a transmitter for combining at least four transmit antennas according to each of at least two sub-channels, and transmitting space-time-coded signals and at least one receiver for receiving the signals through at least two antennas, wherein the receiver includes an ...

05/04/06 - 20060093059 - Interleaver and de-interleaver systems
We describe an interleaver for a MIMO OFDM communications system having a plurality of transmit antennas, said interleaver being configured to interleave a block of N data bits comprising data for a plurality of OFDM symbols, each OFDM symbol being defined by a block of Ncbps bits, by implementing first ...

05/04/06 - 20060093058 - Multiple list link adaptation
The present invention relates to link adaptation in wireless communication, and in particular though not exclusively to wireless local area networks (WLAN). The present invention provides a link adaptation system for communication systems using multiple but separate transmission parameter options. This equates to a “double list” approach compared with the ...

05/04/06 - 20060093057 - System and method for space-time-frequency coding in a multi-antenna transmission system
A method for space-time-frequency coding pieces of data includes receiving a stream of a plurality of pieces of data in a multi-antenna transmission system, where the data may comprise a stream of orthogonal frequency division multiple access (OFDMA) symbols, orthogonal frequency division multiplexed (OFDM) symbols or the like. The pieces ...

05/04/06 - 20060093056 - Signal reception in mobile communication network
A receiver in a mobile communication network, including a receiving unit to receive signals transmitted in at least two channels, a channel estimator to form a channel estimate for each transmit channel, at least two linear filters, wherein each linear filter is configured to filter a signal received on a ...

05/04/06 - 20060093055 - Wireless communication method and apparatus for forming, steering and selectively receiving a sufficient number of usable beam paths in both azimuth and elevation
A wireless communication method of exploiting the radio frequency (RF) physical environment to establish a sufficient number of usable multiple paths of RF propagation for facilitating communications. The method is implemented in a wireless communication system including at least one transmitter and at least one receiver. The receiver's antenna is ...

04/27/06 - 20060088120 - Mixed mode preamble for mimo wireless communications
A method for generating a preamble of a frame for a multiple input multiple output (MIMO) wireless communication begins by, for a first transmit antenna of the MIMO communication, generating a legacy preamble portion for the frame in accordance with a legacy wireless communication protocol, wherein the legacy preamble portion ...

04/20/06 - 20060083327 - Method for phase noise mitigation in mimo-ofdm systems
A phase noise mitigation method which mitigates phase noise for MIMO-OFDM. A criterion is provided which jointly optimizes both spectral efficiency and receiver performance by determining the best number of pilots. ...

04/13/06 - 20060078063 - Block modulation
A device and method for block transmission are provided including means for storing at least one transmission matrix relating to a set of symbols, and means for applying at least part of said at least one transmission matrix to symbols forming at least a subset of said set of symbols ...

04/06/06 - 20060072683 - Method and system for pre-equalization in a single weight spatial multiplexing mimo system
Certain aspects of the method may comprise receiving a plurality of spatially multiplexed communication signals from a plurality of transmit antennas at a base station. A plurality of vectors of baseband combined channel estimates may be generated based on phase rotation of the received plurality of spatially multiplexed communication signals. ...

04/06/06 - 20060072682 - Method and system for pre-equalization in a single weight (sw) single channel (sc) multiple-input multiple-output (mimo) system
In wireless systems, a method and system for pre-equalization in a single weight (SW) single channel (SC) multiple-input multiple-output (MIMO) system are provided. A first receive antenna and at least one additional receive antenna may receive a plurality of SC communication signals transmitted from at least two transmit antennas. Estimates ...

04/06/06 - 20060072681 - Scalable gain retraining generator, method of gain retraining and multiple-input, multiple-output communications system employing the generator or method
The present invention provides a gain retraining generator for use with a MIMO transmitter employing N transmit antennas, where N is at least two. In one embodiment, the gain retraining generator includes a first sequence encoder configured to provide a gain retraining sequence to one of the N transmit antennas ...

04/06/06 - 20060072680 - Method of space-time encoding and decoding for frequency selective fading channel
A space-time encoding and decoding for a frequency selective fading channel. An encoder takes two independent data fields of a time slot in input data as a processing unit with space-time orthogonal encoding method, encodes them and generates two data vectors, and two diversity signals, and transmits them simultaneously, each ...

03/30/06 - 20060067421 - Spatial spreading with space-time and space-frequency transmit diversity schemes for a wireless communication system
Techniques for transmitting data using a combination of transmit diversity schemes are described. These transmit diversity schemes include spatial spreading, continuous beamforming, cyclic delay diversity, space-time transmit diversity (STTD), space-frequency transmit diversity (SFTD), and orthogonal transmit diversity (OTD). A transmitting entity processes one or more (ND) data symbol streams based ...

03/30/06 - 20060067420 - Multiple input multiple output orthogonal frequency division multiplexing mobile comminication system and channel estimation method
The present invention provides a channel estimation method for a Multiple Input Multiple Output Orthogonal Frequency Division Multiplexing system, characterized by comprising steps of: for each of a plurality of receiving antennas of said Orthogonal Frequency Division Multiplexing system, calculating a channel impulse response sequence and a channel frequency response ...

03/30/06 - 20060067419 - High rate, high diversity transmission on multiple transmit antennas
High data rate, high diversity transmission is provided in a dual transmit antenna system over multiple sample times though the use of coding. ...

03/16/06 - 20060056534 - Method and apparatus to balance maximum information rate with quality of service in a mimo system
Disclosed is a method to operate a wireless MIMO communication system, where the method includes, for N symbols of a frame of information to be transmitted through a plurality of eigen sub-channels, allocating N1, symbols to a stronger eigen sub-channel and N2 symbols to a weaker eigen sub-channel, where N1, ...

03/16/06 - 20060056533 - Minimizing feedback rate for channel state information in mimo systems
A method minimizes a rate for feeding back channel state information from a receiver to a transmitter in a multi-input, multi-output communications systems. A temporal autocorrelation function of the channel between the transmitter and the receiver is determined. A spatial covariance information is estimated of the channel. Then, the minimum ...

03/16/06 - 20060056532 - Calibration in mimo systems
Aggregate channel reciprocity in a wireless system is supported by calibrating transmitter/receiver pairs. ...

03/16/06 - 20060056531 - Interpolation in channel state feedback
Feedback bandwidth may be reduced in a closed loop MIMO system by Householder transformations, vector quantization using codebooks, and down-sampling in the frequency domain. ...

03/09/06 - 20060050804 - Method for decoding linear space-time codes in a multiple-antenna wireless transmission system and decoder therefor
An iterative method and a decoder for decoding space-time codes in a communication system with multiple transmission and reception antennae, strikes a compromise between techniques based on interference cancellation algorithms such as BLAST, which show faulty performance concerning error rate based on signal-to-noise ratio and techniques based on maximum likelihood ...

03/02/06 - 20060045201 - Apparatus and method for full-diversity, full-rate space-time block coding for two transmit antennas
An apparatus and method for full-diversity, full-rate space-time block coding in a transmitter using two Tx antennas are provided. An input symbol sequence is STBC-encoded in a predetermined method and transmitted through the two Tx antennas. ...

03/02/06 - 20060045200 - Signal receiving method in mimo system and device therefor
Transmitted symbols are estimated from received signals. The likelihood of the estimated transmitted symbols is calculated. The mean value and variance of the transmitted symbols are calculated from information indicating the likelihood, and MMSE coefficient for compensating the channel is calculated according to the mean value and variance. The transmitted ...

03/02/06 - 20060045199 - Multiple streams using partial stbc with sdm within a wireless local area network
A method of communicating data to M receiving antennas from N transmitting antennas, where M and N are integers, the method includes the steps of receiving M data signals from M receive antennas, applying the M data signals to a space/time decoder to produce M decoded streams and reconstructing original ...

03/02/06 - 20060045198 - Single reference clock design for radios used in wireless mimo communication systems
A system and method are provided for eliminating the relative phase behavior in the transmitter and receiver radios employed in a wireless MIMO communication system. The method employs a single synthesizer and allows multiple transceivers to function with the same RF reference frequency source and/or IF reference frequency source. Since ...

02/23/06 - 20060039497 - Linear precoding for multi-input systems based on channel estimate and channel statistics
A method, processor and system for linear preceding for a multiple-input communication channel described in terms of an effective mean and an effective correlation is provided. The effective mean and correlation can be the sample mean and correlation of the channel, or they can also include an estimate of the ...

02/23/06 - 20060039496 - Apparatus and method for space-time-frequency block coding for increasing performance
A space-time-frequency block coding apparatus and method in a transmitter with three transmit (Tx) antennas are provided. An input symbol sequence is transmitted through three Tx antennas according to a set method using feedback information received from a receiver or using a selected transmission matrix having regularities in order to ...

02/23/06 - 20060039495 - Apparatus and method for space-time block coding for increasing coding gain
A space-time block coding apparatus and method in a transmitter with four transmit antennas in a system using a space-time block coding scheme, a pre-coder pre-codes an input symbol sequence by multiplying the input symbol sequence by ejθ, θ being a phase rotation angle, in case of QPSK in range ...

02/23/06 - 20060039494 - Apparatus and method for beamforming in a multi-antenna system
An apparatus and method for performing beamforming for transmitting a plurality of bit streams output through Adaptive Modulation and Coding (AMC) via a plurality of transmission antennas in a base station using a multi-antenna scheme. The apparatus and method include classifying the plurality of transmission antennas into a plurality of ...

02/23/06 - 20060039493 - Generalized m-rank beamformers for mimo systems using successive quantization
The telecommunications system described herein implements a multi-rank beamformer for use in wireless systems equipped with multiple transmit and multiple receive antennas. The multi-rank beamformer uses finite-rate feedback of channel conditions to achieves close to theoretical performance indicated by the water-filling algorithm, while avoiding the computational complexity associated with space ...

02/16/06 - 20060034387 - Method and system for utilizing space-time overlays for convolutionally coded systems
A communication system for transmitting encoded signals over a communication channel is disclosed. The system includes a transmitter, which has a source that is configured to output a message signal, and an encoder that is configured to generate a code word in response to the message signal. The code word ...

02/16/06 - 20060034386 - Method and system for rate-2 transmission
Signal encoding in a multiple input multiple output system in a wireless communication network is provided. The communication system provides a method of encoding and transmitting symbols in a rate-2 complex symbol per second per Hertz transmission system that achieves a maximum diversity of four for a four transmit antenna ...

02/16/06 - 20060034385 - Wireless communication apparatus and method for estimating number of antennas
wireless communication apparatus (transmitter) including a plurality of antennas for transmitting a plurality of known symbol sequences and data symbols, transmits the known symbol sequences, each of the known symbol sequences including a plurality of known symbols, each of the known symbols whose plural known information being carried on a ...

02/16/06 - 20060034384 - Method and system for communicating data frames
For communicating data frames, a respective data frame is transmitted from each of a plurality of transmitter antennas of a transmitter. In addition, a power of any data field that is of a predetermined data type within the respective data frames is boosted to a maximum available power of the ...

02/16/06 - 20060034383 - Systems and methods for coding in broadband wireless communication systems to achieve maximum diversity in space, time and frequency
Maximum diversity in multiple antenna distributed frequency broadband systems such as MIMO-OFDM is achievable through space-frequency (SF) and space-time-frequency (STF) coding. Full-rate full-diversity coding is achieved through a combination of maximal minimum product distance symbol set design and formation of codeword blocks. Full-diversity codes are also achieved which have reduced ...

02/16/06 - 20060034382 - Method and apparatus for subcarrier and antenna selection in mimo-ofdm system
A method and apparatus for radio resources control in a multiple input multiple output (MIMO) orthogonal frequency division multiplexing (OFDM) communication system are disclosed. Channel metric is calculated for each of a plurality of transmit antennas. Sub-carriers are allocated to each transmit antenna in accordance with the channel metric of ...

02/16/06 - 20060034381 - Method and apparatus using coordinate interleaving to increase diversity in a mimo system
A method to increase diversity in MIMO fading channels interleaves coordinates of complex symbol(s) in a transmission frame after encoding and modulating. Specifically, an input signal is encoded and modulated into a codeword, jointly across at least two pipes, said pipes having space, time, frequency, or other nature, wherein the ...

02/09/06 - 20060029149 - Method and apparatus for receiving signals in mimo system
An improved receiver for a multicarrier-based MIMO (Multiple-Input Multiple-Output) system is provided. A MIMO receiving apparatus includes a detection priority decision unit, which receives via N receiving antennas signals transmitted from M transmitting antennas and determines the detection priorities of the signals, and a signal detector, which successively detects the ...

02/09/06 - 20060029148 - Method and apparatus for training using variable transmit signal power levels
A method and apparatus for a multiple channel communication device training, and processing utilizing a transmit signal power control operation. Multiple channel communication devices utilize inter-channel crosstalk mitigation techniques, such as MIMO processing modules or MIMO precoding systems, to cancel unwanted crosstalk coupling across active and provisioned channels. Upon provisioning ...

02/09/06 - 20060029147 - Method and apparatus for training using variable transmit signal power levels
A method and apparatus for a multiple channel communication device training, and processing utilizing a transmit signal power control operation. Multiple channel communication devices utilize inter-channel crosstalk mitigation techniques, such as MIMO processing modules or MIMO precoding systems, to cancel unwanted crosstalk coupling across active and provisioned channels. Upon provisioning ...

02/09/06 - 20060029146 - Multi-antenna communication systems utilizing rf-based and baseband signal weighting and combining
A receiver operatively coupled to an antenna structure capable of receiving a first plurality of RF signals is disclosed herein. The receiver includes an RF processing network operative to perform weighting and combining operations within the RF domain using the first plurality of RF signals so as to produce a ...

02/02/06 - 20060023804 - Scalable time-switched preamble supplment generator, method of generating and multiple-input, multiple-output communication system employig the generator and method
The present invention provides a time-switched preamble supplement generator for use with a multiple-input, multiple-output (MIMO) transmitter employing N transmit antennas wherein N is at least two. In one embodiment, the time-switched preamble supplement generator includes an initial preamble supplement formatter configured to provide a first permutation of a set ...

02/02/06 - 20060023803 - System and method for distributed input-distributed output wireless communications
A method is described comprising: transmitting a training signal from each antenna of a base station to each of a plurality of client devices, each of the client devices analyzing each training signal to generate channel characterization data, and transmitting the channel characterization data back to the base station; storing ...

01/26/06 - 20060018398 - Base station software for multi-user detection uplinks and downlinks and method thereof
A method of multi-user detection in a given uplink and downlink time slot in a software-defined receiver which includes filtering and sampling a received signal; forming a block-banded matrix A of the sampled signals; and solving {circumflex over (d)}=T−1y, where T=(AHA), y=AHx. The methods of solving for the matrix T ...

01/26/06 - 20060018397 - Capacity based rank prediction for mimo design
The performance of a Single Code Word (SCW) design with low complexity MMSE receiver & rank prediction is similar to the Multiple Code Word (MCW) design with successive interference cancellation (SIC). A method of rank prediction comprises calculating MIMO channel matrices corresponding to layer transmissions for each tone, calculating signal-to-noise ...

01/19/06 - 20060013330 - Mimo transmission system and method of ofdm-based wireless lan systems
A MIMO transmission system and method of an OFDM-based wireless LAN system. The MIMO transmission system includes multiple transmission paths to channel antennas and receives and encodes plural rows of bit streams. The MIMO transmission system does not transmit the plural rows of bit streams through the same paths and ...

01/19/06 - 20060013329 - Signal transmitting device and method of multiple-antenna system
A signal transmitting device and method are provided which separate signals simultaneously transmitted through a multiple-antenna system into respective sub-channel signals. The method includes separating a transmission channel into spatial sub-channels in a time division duplex (TDD) system using a multiple-antenna system. The factors for channel separation of a current ...

01/19/06 - 20060013328 - Method and detector for a novel channel quality indicator for space-time encoded mimo spread spectrum systems in frequency selective channels
In a jointly encoded (JE), spread spectrum communication MIMO system where a demultiplexed packet is transmitted over multiple streams, two versions of a single channel quality indicator (CQI) is disclosed: generalized SNR or constrained mutual information CMI between the transmitted and received chip vectors. In the receiver, the CMI is ...

01/12/06 - 20060008025 - Method and system for rate-2 transmission
The invention relates generally to the field of signal encoding in a multiple input multiple output system in a wireless communication network. This invention specifically relates to a method of encoding and transmitting symbols in a rate-2 complex symbol per second per Hertz transmission system that achieves a maximum diversity ...

01/12/06 - 20060008024 - Multiple input, multiple output communications systems
Embodiments of the present invention include systems and methods for optimizing the transmitter and receiver weights of a MIMO system. In one embodiment, the weights are optimized to create and steer beam nulls, such that each transmitted signal is substantially decoupled from all other signals between a MIMO transmitter a ...

01/12/06 - 20060008023 - Scalable time-orthogonal preamble supplement generator, method of generating and multiple-input, multiple-output communication system employing the generator and method
The present invention provides a time-orthogonal preamble supplement generator for use with a multiple-input, multiple-output (MIMO) transmitter employing N transmit antennas, where N is at least two. In one embodiment, the time-orthogonal preamble supplement generator includes an initial preamble supplement encoder configured to provide a preamble supplement to each of ...

01/12/06 - 20060008022 - Multiple input, multiple output communications systems
Embodiments of the present invention include systems and methods for optimizing the transmitter and receiver weights of a MIMO system. In one embodiment, the weights are optimized to create and steer beam nulls, such that each transmitted signal is substantially decoupled from all other signals between a MIMO transmitter a ...

01/12/06 - 20060008021 - Reduction of self-interference for a high symbol rate non-orthogonal matrix modulation
A method for reducing self-interference between at least four data symbols that are modulated via a non-orthogonal matrix modulation and transmitted from at least four transmit antennas to at least one receive antenna comprises mapping the at least four data symbols onto the at least four transmit antennas and two ...

01/05/06 - 20060002487 - Methods and apparatus for parametric estimation in a multiple antenna communication system
Methods and apparatus are disclosed for processing received data in a multiple input multiple output (MIMO) communication system. A multiple antenna receiver can distinguish a MIMO transmission from other transmissions based on the detection of a predefined symbol following a legacy portion of a preamble. A preamble comprises a legacy ...

12/29/05 - 20050286651 - Wireless communication apparatus
A wireless communication apparatus having a plurality of antennas for transmitting a known symbol by using a plurality of subcarriers to a receiver, the known symbol including known information, the apparatus includes each of the subcarriers which carries the known information being classified into at least two groups, and a ...

12/29/05 - 20050286650 - Apparatus and method for providing transmit diversity in a mobile communication system using multiple antennas
A transmit diversity apparatus and method are provided for adaptively providing a transmit diversity gain or a beamforming gain depending on changes in a radio channel undergoing multipath fading in a mobile communication system using multiple antennas. A transmitter forms as many fixed beams as the number of transmit antennas ...

12/22/05 - 20050281351 - Apparatus and method for full-diversity, full-rate space-time block coding for even number of transmit antennas
A mobile communication system using an STBC scheme having an even number of Tx antennas is provided. In a transmitter having an even number of Tx antennas, a pre-coder pre-codes an input symbol sequence using a pre-coding matrix. The pre-coding matrix is a matrix produced by puncturing a unitary matrix. ...

12/22/05 - 20050281350 - Apparatus and method for space-frequency block coding/decoding in a communication system
An apparatus and method for SFBC coding and decoding in a communication system using a plurality of (N1) Tx antennas are provided. In a transmitter using Nt transmit antennas, a pre-coder pre-codes an input symbol sequence using a pre-coding matrix. The pre-coding matrix is produced by puncturing a unitary matrix ...

12/22/05 - 20050281349 - Multiple streams using stbc with higher data rates and diversity gain within a wireless local area network
A method of communicating data to M receiving antennas from N transmitting antennas, where M and N are integers, the method includes the steps of producing N data streams from outbound data, applying the N data streams to a space/time encoder to produce N encoded signals and transmitting the N ...

12/22/05 - 20050281348 - Stbc with multiple streams in ofdm for wlan and error metrics for soft decision with channel information
A method of receiving data over M receiving antennas from N transmitting antennas, where M and N are integers, includes the steps of receiving M signals over the M receiving antennas, applying the M signals to a space/time decoder, determining noise powers for M channels, with the M channels being ...

12/22/05 - 20050281347 - Method of operating multi-antenna wireless data processing system
A method of operating a wireless data processing system to selectively enable a multi-antenna processor to demodulate N separate data signals from M separate antennas simultaneously. The multi-antenna processor is adapted to respond to changing channel conditions between two access points, so that it selectively kicks in if there is ...

12/08/05 - 20050271157 - Detecting the number of transmit antennas in wireless communication systems
To detect the number of transmit antennas, a fast Fourier transform operation is performed on the received samples of the transmitted long training symbols of a preamble. Next, each of the Fourier transformed results is multiplied with the reference frequency-domain representation of the long training symbol so as to remove ...

12/01/05 - 20050265473 - Method and device for processing received data of a radio interface
The invention relates to an apparatus and method for processing received data (I1/Q1, I2/Q2; d1, d2) of a radio interface, wherein the received data includes a sequence of data which have been transmitted for the purpose of error reduction through different branches of a carrier (Rk) of the radio interface, ...

12/01/05 - 20050265472 - Wireless communication apparatus
Before data is transmitted from a plurality of antennas, a plurality of known symbol sequences are transmitted from these antennas. Each known symbol sequence contains a plurality of known symbols having different subcarrier arrangements. Known symbols transmitted from different antennas have different subcarrier arrangements. ...

12/01/05 - 20050265471 - Method and apparatus for space division multiple access receiver
Methods and systems consistent with this invention receive a plurality of transmitted signals in a receiver having a plurality of receive elements, wherein each transmitted signal has a different spatial location. Such methods and systems receive the plurality of transmitted signals the plurality of receive elements to form a plurality ...

12/01/05 - 20050265470 - Radio communication system, radio communication method, and radio communication device
In the environment of a communication area including a SDM-compatible mobile station for space division multiplex transmission and a SDM-uncompatible mobile station not compatible with space division multiplex transmission, a base station having a plurality of antennas and capable of adaptively changing directivity performs allocation of a mobile station which ...

11/17/05 - 20050254592 - Time varying cyclic delay diversity of ofdm
Methods and apparatuses that apply a time-varying delay to symbols to be transmitted from one or more antennas are provided. ...

11/17/05 - 20050254591 - Diverse antenna method and system employing a case mounted antenna
A desktop computer case mounted antenna apparatus for providing a diverse antenna solution for wireless network communications and computing systems employing the same are disclosed. In one embodiment, the antenna is mounted, at least partially, within a peripheral drive bay of the case. ...

11/17/05 - 20050254590 - Receiver, arrangement and method for decoding signal
A solution for decoding a signal transmitted using space time block coding transmit diversity is provided. A given number of complex coded symbols are loaded to the input of a decoding processor. Complex instructions belonging to the instruction set of the decoding processor are performed on the complex coded symbols, ...

11/10/05 - 20050249306 - Apparatus and method for encoding/decoding space tine block code in a mobile communication system using multiple input multiple output scheme
Disclosed is an apparatus and method for encoding/decoding a space time block code in a mobile communication system using a multiple input multiple output scheme. In a transmitter employing a plurality of transmit antennas in the mobile communication system, if a signal to be transmitted is input, the transmit signal ...

11/10/05 - 20050249305 - Midamble allocations for mimo transmissions
Allocation of multiple training sequences transmitted in a MIMO timeslot from multiple transmit antenna elements is provided. For example, a method of generating signals in a MIMO timeslot, the method comprising: selecting a first training sequence; preparing a first data payload; generating a first signal including the prepared first data ...

11/10/05 - 20050249304 - Wireless communication system, wireless communication apparatus, wireless communication method, and computer program therefor
Communication operation is performed with enhanced transmission efficiency by obtaining enhanced communication capacity through optimal allocation of transmission powers to individual MIMO channels obtainable by spatial multiplexing. A transmitter has a plurality of transmission antennas and a receiver has a plurality of reception antennas and perform spatial multiplex communication through ...

11/10/05 - 20050249303 - System, method, apparatus, and computer program for wireless communication
The disclosed invention enhances transmission efficiency by decreasing regions of reference signals which are attached to transmit packets from a transmitter during bidirectional SVD-MIMO communication. The transmitter transmits user data following a reference signal. At the other end, the receiver acquires a channel matrix, based on the reference signal attached ...

11/10/05 - 20050249302 - System and method of a mimo transmitter / receiver
The proposed Multiple Input Multiple Output (MIMO) transmitter/receiver system having a reduced complexity decoder for receiving and decoding simultaneously a plurality of transmitted signals, wherein said transmitter includes a space time coded modulation (STCM) block. The transmitter/receiver system provides a reduced complexity approximation of optimal MLE methods while maintaining most ...

11/03/05 - 20050243943 - Equalising structure and method with maximum likelihood detection
The present invention relates to an equalising structure and method for a receiving device of a wireless communication system, in which transmit information is modulated onto carrier signals according to a modulation scheme, whereby all possible data symbols are represented as constellation points in the signal constellation of the modulation ...

11/03/05 - 20050243942 - Wireless communication system
In order to transmit a large amount of data in series at a time with a MIMO communication scheme while avoiding deterioration of decoding characteristics due to change over time by a channel matrix, a wireless communication system uses an open-loop type and a closed-loop type of MIMO communication modes ...

10/27/05 - 20050238111 - Spatial processing with steering matrices for pseudo-random transmit steering in a multi-antenna communication system
Techniques for generating and using steering matrices for pseudo-random transmit steering (PRTS) are described. For PRTS, a transmitting entity performs spatial processing with steering matrices so that a data transmission observes an ensemble of “effective” channels formed by the actual channel used for data transmission and the steering matrices used ...

10/20/05 - 20050232370 - Long training sequence for mimo wlan systems
A method for configuring a multiple input multiple output (MIMO) wireless communication begins by generating a plurality of preambles for a plurality of transmit antennas. Each of the plurality of preambles includes a carrier detection sequence at a legacy transmit rate, a first channel sounding at the legacy transmit rate, ...

10/13/05 - 20050226344 - I/q mimo detection for single antenna interference cancellation
An I/Q MIMO detection framework is a practical means to realize interference cancellation (IC) gains when GMSK, 8PSK signals interfere with each other in synchronous GSM/EDGE networks, thereby providing coverage, capacity, and throughput gain. Further, the presented algorithm applies to a high data rate system concept, in which multiple signals ...

10/13/05 - 20050226343 - Method and apparatus to select coding mode
Briefly, an apparatus and method that may adaptively select a coding mode of an OFDM sub-carrier symbol of a data stream according to a received channel state information related to the OFDM sub-carrier. ...

10/06/05 - 20050220211 - Signal processing apparatus and method in multi-input/multi-output communications systems
A signal processing apparatus in a multi-input/multi-output (MIMO) communication system includes a transmitting end in which a code rate is differently set and a respectively different modulation method is performed at each antenna in consideration of a channel situation of each transmission antenna, coded bits are separately interleaved, and then ...

10/06/05 - 20050220210 - Method and construction for space-time codes for am-psk constellations
Space-time codes are developed for multi-radii AM-PSK constellations. Further, a “super-unified” space-time code construction is developed that incorporates multi-radii AM-PSK codes with the Lu-Kumar unified codes. The multi-radii space-time codes achieve the rate-diversity tradeoff—that is, the codes transmits information at the maximum rate possible for the given signaling constellation and ...

10/06/05 - 20050220209 - Operation for backward-compatible transmission
The present invention relates to a transmitter in a transmission system operable to optimize estimates of a quantity at a receiver for improved operation. The transmission system includes a transmitting means connected to a number of antennas (Txm), and to control means. The control means controls the transmitting means to ...

10/06/05 - 20050220208 - Wireless transmitting device and wireless receiving device
A wireless transmitting device for use in communication with a wireless receiving device with a wireless packet, includes a plurality of antennas; and a signal generator configured to generate a signal for the wireless packet being transmitted, the wireless packet comprising a short-preamble sequence, a first long-preamble sequence, a signal ...

10/06/05 - 20050220207 - System and method for enhancing near vertical incidence skywave (nvis) communication using space-time coding
A system and method are described in which space-time coding techniques are used to transmit and receive multiple data streams within a near vertical incidence skywave (“NVIS”) communication system. Within the NVIS communication system, multiple independent data streams may be transmitted from a transmitting station at a high radiation angle, ...

10/06/05 - 20050220206 - Device, system and method for wireless combined-signal communication
Briefly, some embodiments of the invention may provide devices, systems and methods for wireless combined-signal communication. For example, a method in accordance with an embodiment of the invention may include transmitting a combined signal over a combined channel by mapping a first block of said combined signal to be carried ...

09/29/05 - 20050213682 - Apparatus and method for transmitting and receiving data in a mobile communication system using an array antenna
An apparatus and a method for transmitting and receiving data in a mobile communication system including an array antenna. The method includes the steps of transmitting pilot channels through a transmission antenna while aligning the pilot channels orthogonally to each other, receiving feedback information related to the pilot channels from ...

09/22/05 - 20050207508 - Joint timing recovery for multiple signal channels
A spatial diversity receiver and method for determining a multichannel combined symbol timing marker that identifies an energy concentration for a combination of channel delay spreads in order to reduce the complexity of equalization. The receiver includes two or more receiver chains having spatially diverse antennas; a multichannel combined timer; ...

09/15/05 - 20050201482 - Communication system and apparatus, and control method therefor
A wireless communication apparatus comprises: a plurality of antenna means for receiving a wireless reception signal from a secondary communication apparatus; and a combining means for combining signals from the plurality of antennas to from a combined signal or for selecting one of the signals from the plurality of antennas. ...

09/08/05 - 20050195915 - Spatio-temporal processing for communication
A space-time signal processing system with advantageously reduced complexity. The system may take advantage of multiple transmitter antenna elements and/or multiple receiver antenna elements, or multiple polarizations of a single transmitter antenna element and/or single receiver antenna element. The system is not restricted to wireless contexts and may exploit any ...

09/08/05 - 20050195914 - Method for deciding signal detection order in mobile communication system
Disclosed is a method for deciding a signal detection order in a mobile communication system that supports an adaptive modulation technology. The detection order that maximizes a channel, in which a product of the minimum symbol distance for each modulation rate and the effective SINR becomes minimum, maximum is selected ...

09/08/05 - 20050195913 - Communications system, method and device
A communications system (101) comprises a transmitting device (102) and a receiving device (114). The transmitting device (102) comprises at least T transmit antennas (116), means for spreading (110) each of T symbols (x) in the time domain only to produce T time sequences of chips (x1, x2, X3=X) and ...

09/08/05 - 20050195912 - Method and system for transmitting and receiving data streams
A method and system for transmitting and receiving data using a plurality of antennas are disclosed. The method of transmitting includes the steps of receiving feedback information from a receiving end, the feedback information including group selection information and weight values for the plurality of antennas, grouping the plurality of ...

09/01/05 - 20050190850 - Wireless communication system, wireless communication apparatus, wireless communication method, and computer program
An SVD-MIMO transmission compresses the amount of information to be fed back to a transmitter from a receiver. The transmitter and the receiver share a representation form of (amplitude, phase) for representing data to be transmitted, i.e., a form of converting real data into complex data. In other words, transmitted ...

09/01/05 - 20050190849 - Communications system, method and device
A communications system (201) comprises a transmitting device (202) having a plurality of transmit antennas (206) and a receiving device (214) having a plurality of receive antennas (218). When it is determined that an error has occurred in a first data transmission attempt in which data signals (x) are transmitted ...

08/25/05 - 20050185730 - Asymmetrical multiple stream wireless communication using stbc
A method of communicating data to M receiving antennas from N transmitting antennas, where M and N are integers and unequal, has the steps of sending a message to determine a number of transmit paths to be used, awaiting an acknowledgement message comprising a number of receiver paths, setting the ...

08/25/05 - 20050185729 - Reduced complexity multi-turbo multi-user detector
A reduced complexity Turbo multi-user detector (MUD) processing system in multiple access communications channels that decreases the likelihood of improper decoding of the final values of interest and decreases the computation complexity for each iteration, thereby allowing for a reduction in the number of iterations performed and lowers the overall ...

08/25/05 - 20050185728 - Calibration of downlink and uplink channel responses in a wireless mimo communication system
The downlink and uplink are calibrated to account for differences in the responses of transmit and receive chains at an access point and a user terminal. For initial calibration, the access point and user terminal transmit MIMO pilots on the downlink and uplink, which are used to derive channel estimates ...

08/11/05 - 20050175116 - Ofdm, cdma, spread spectrum,tdma, cross-correlated and filtered modulation
Modulators for switched or switched and combined Orthogonal Frequency Division Multiplexed (OFDM), Code Division Multiple Access (CDMA), Spread Spectrum, Time Division Multiple Access (TDMA), cross-correlated and filtered systems. A first modulation circuit for receiving input OFDM baseband signals and a second modulation circuit for receiving input in-phase and quadrature-phase cross-correlated ...

08/11/05 - 20050175115 - Spatial spreading in a multi-antenna communication system
Spatial spreading is performed in a multi-antenna system to randomize an “effective” channel observed by a receiving entity for each transmitted data symbol block. For a MIMO system, at a transmitting entity, data is processed (e.g., encoded, interleaved, and modulated) to obtain ND data symbol blocks to be transmitted in ...

08/04/05 - 20050169399 - Signal field scaler, method of scaling a signal field and communications system employing the same
The present invention provides a signal field scaler for use with a multiple-input, multiple-output (MIMO) transmitter employing N transmit antennas, where N is at least two. In one embodiment, the signal field scaler includes a signal field generator configured to provide a signal field corresponding to a multiple concurrent transmission ...

08/04/05 - 20050169398 - Scalable gain training generator, method of gain training and mimo communication system employing the generator and method
The present invention provides a gain training generator for use with a multiple-input, multiple-output (MIMO) transmitter employing N transmit antennas where N is at least two. In one embodiment, the gain training generator includes a fundamental training encoder configured to provide a basic gain training sequence to one of the ...

08/04/05 - 20050169397 - Scalable data reception gain control for a multiple-input, multiple-output (mimo) communications system
The present invention provides a concurrent gain generator for use with a MIMO transmitter having an N of two or more transmit antennas. In one embodiment, the concurrent gain generator includes a first sequence formatter that provides one of the N transmit antennas with a gain training sequence during an ...

08/04/05 - 20050169396 - Method for transmitting information in a mimo radio communication system and radio communication system
A method is provided for transmitting information in a radio communication system provided with at least one transmitting station (AP) and at least two receiver stations (MT). The transmitting station (AP) and the receiver stations (MT) are connected together via a radio communication interface. The transmitting stations (AP) includes a ...

07/28/05 - 20050163246 - Differential transmitter diversity technique for wireless communications
Input signals of each frame are encoded by mapping the signals onto a coordinate system dictated by the symbols of the previous frame, and symbols from a constellation are selected based on the results of such mapping. Received signals are detected by preprocessing the signals detected at each antenna with ...

07/28/05 - 20050163245 - Data encoding for static mimo channels
A channel scrambler for use in a transmitter employing a plurality of transmit antennas comprises at least two signal inputs for inputting a signal and a processor for applying a time-varying scrambling matrix to each input signal to produce a scrambled signal. An output stage is provided for outputting each ...

07/28/05 - 20050163244 - Wireless transmitting method, wireless transmitting device, wireless receiving method, wireless receiving device
In a wireless transmitting device which performs transmission by an OFDM using a plurality of subcarriers orthogonal to each other, a plurality of preambles to which a plurality of different subcarrier groups selected from a plurality of subcarriers within an OFDM signal band are allocated are transmitted by using a ...

07/28/05 - 20050163243 - Constellation-rotating orthogonal space-time block coding technique
A coding technique for achieving a maximum diversity gain in a wireless communication system having a transmitter for transmitting data on a fading channel through a plurality of transmit antennas and a receiver for receiving the data through a plurality of receive antennas. In the coding technique, P mth-order sub-rotated ...

07/21/05 - 20050157811 - Iterative detection and decoding for a mimo-ofdm system
Techniques to iteratively detect and decode data transmitted in a wireless (e.g., MIMO-OFDM) communication system. The iterative detection and decoding is performed by iteratively passing soft (multi-bit) “a priori” information between a detector and a decoder. The detector receives modulation symbols, performs a detection function that is complementary to the ...

07/21/05 - 20050157810 - Spatio-temporal processing for communication
A space-time signal processing system with advantageously reduced complexity. The system may take advantage of multiple transmitter antenna elements and/or multiple receiver antenna elements, or multiple polarizations of a single transmitter antenna element and/or single receiver antenna element. The system is not restricted to wireless contexts and may exploit any ...

07/21/05 - 20050157809 - Decoding apparatus and method of mimo system
An apparatus and method for decoding a MIMO system are disclosed. By employing an SIC(Successive Interference Cancellation)-based iterative decoding algorithm in the T-BLAST system or by applying the SIC-based iterative decoding algorithm in combination with PIC(Parallel Interference Cancellation) to the T-BLAST system, a high order of modulation method can be ...

07/21/05 - 20050157808 - Signal transmission method of closed-loop mimo system
A closed-loop MIMO system includes a receiver for forming a new predefined set by using elements of a previous predefined set, selecting a certain matrix of the new predefined set, and feeding back an index of the matrix, if the number of transmit antennas increases, and a transmitter for performing ...

07/21/05 - 20050157807 - Method for transmitting/receiving signal in mimo system
Disclosed is a method for transmitting a signal in a mobile communications system using a plurality of transmit/receive antennas. A method for transmitting a signal in accordance with an embodiment of the present invention comprises the steps of: a receiving end's calculating a signal to interference noise ratio (SINR) with ...

07/21/05 - 20050157806 - Broadcast transmission with spatial spreading in a multi-antenna communication system
An access point in a multi-antenna system broadcasts data using spatial spreading to randomize an “effective” channel observed by each user terminal for each block of data symbols broadcast by the access point. At the access point, data is coded, interleaved, and modulated to obtain ND data symbol blocks to ...

07/21/05 - 20050157805 - Data transmission with spatial spreading in a mimo communication system
For data transmission with spatial spreading, a transmitting entity (1) encodes and modulates each data packet to obtain a corresponding data symbol block, (2) multiplexes data symbol blocks onto NS data symbol streams for transmission on NS transmission channels of a MIMO channel, (3) spatially spreads the NS data symbol ...

07/07/05 - 20050147177 - Method of controlling signal transmission in multi-input/multi-output system
A method of controlling signal transmission in a Multiple Input Multiple Output (MIMO) communication system including selecting a modulation and code set (MCS) for each of M data streams transmitted via M transmitting antennas in a transmitting side of the MIMO system, and selectively selecting M-1 or fewer transmitting antennas ...

06/30/05 - 20050141632 - Data transmission/reception apparatus and method for improving performance in a mobile communication system using space-time trellis code
Disclosed is a space-time trellis code (STTC) encoding method for performing space-time coding of a serially-concatenated space-time code (SC-STC) in an encoder having an outer encoder for performing channel coding and an inner encoder for performing the space-time coding, in a mobile communication system including one or more transmission antennas, ...

06/30/05 - 20050141631 - Wireless communication system, wireless communication device and wireless communication method, and computer program thereof
The invention realizes an SVD-MIMO transmission having resistance to the variations in the channel characteristic, which saves the feedback from the receiver to the transmitter. The receiver updates the current one into a new channel matrix Hnew every 100 OFDM symbols, and performs the reception processing by updating the current ...

06/30/05 - 20050141630 - Weight generation method for multi-antenna communication systems utilizing rf-based and baseband signal weighting and combining based upon minimum bit error rate
A signal weighting and combining method implemented within a receiver having a plurality of receive antennas is disclosed herein. Each receive antenna is disposed to produce a received RF signal in response to a transmitted RF signal received through a channel. The method includes weighting the plurality of received RF ...

06/23/05 - 20050135500 - Space-time block coding method using auxiliary symbol
A space-time block coding method using an auxiliary symbol in a multiple transmit/receive antenna system is provided. In the space-time block coding method, binary data to be transmitted is received. Free symbols and an auxiliary symbol are generated by dividing the received binary data into units of a predetermined number ...

06/23/05 - 20050135499 - Differential space-time block coding apparatus using eight or less transmit antennas
A differential STBC transmitting/receiving apparatus in a multiple antenna system using eight or less transmit antennas is provided. In the differential STBC transmitting apparatus, a symbol mapper receives binary data and generates a number of symbols from the binary data, each symbol having a number of bits. A space-time block ...

06/23/05 - 20050135498 - Signal decoding methods and apparatus
This invention is generally concerned with methods, apparatus and processor control code for decoding signals, in particular by means of sphere decoding. A sphere decoder configured to search for one or more strings of symbols less than a search bound from an input signal by establishing a value for each ...

06/23/05 - 20050135497 - Adaptive transmitting and receiving device and method in wireless communication system using frequency division duplexing
Disclosed is an adaptive transmitting and receiving device and method using frequency division duplexing. A transmitter transmits a preamble or a pilot to a receiver. The receiver estimates a received SNR from the preamble or pilot, determines parameters (received log likelihood ratio parameters) of determining the distribution of the received ...

06/16/05 - 20050129137 - Multiple-output multiple-input (mimo) communication system, mimo receiver and mimo receiving method
This invention provides an MIMO communication system and MIMO communication method. An MIMO receiver estimates state of each communication channel from the received signals received by #1 to #L antennas, generates feedback information according to the information of channel state, sends the feedback information to a transmitter through a feedback ...

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