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Multiplex Communications > Generalized Orthogonal Or Special Mathematical Techniques Generalized Orthogonal Or Special Mathematical TechniquesGeneralized Orthogonal Or Special Mathematical Techniques 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.01/17/08 - 20080013444 - Wireless communications apparatus In a wireless communications system, an inverse of a lattice reduction matrix can be obtained at the same time as performance of the LLL algorithm to determine the lattice reduction. This is achieved by interposing in the LLL algorithm corresponding steps applied to a running calculation of the inverse matrix. ... 01/10/08 - 20080008082 - Method and apparatus for estimating timing error and frequency offset of hpi system The present invention relates to a method for estimating a timing error and a frequency offset in a high-speed portable Internet system and a method thereof. A predetermined preamble symbol is added to an OFDM frame to be transmitted by a transmitter according to an exemplary embodiment of the present ... 12/20/07 - 20070291633 - Transmitting apparatus in orthogonal frequency division multiplexing access system capable of controlling gain for variation of sub-channel allocation and method for transmitting data thereof The present invention relates to a transmitter of an OFDMA system capable of controlling a gain for variation of subchannel allocation, and a method thereof. The transmitter includes a subchannel number determining unit, a modulator, a digital/analogue converter, and a gain controller controlling the gain. The subchannel number determining unit ... 12/20/07 - 20070291632 - Method for detecting symbol timing of multi-antenna radio communication system There is provided a method for detecting a symbol timing of a multi-antenna radio communication system. The method can significantly reduce a calculation amount in a space division multiplex OFDM system as compared to the conventional method, can detect an accurate symbol timing, and can easily be realized. In this ... 12/13/07 - 20070286063 - Ofdm in fast fading channel Detection of OFDM symbols generates an equivalent vector which represents the sufficient statistics (SS) which are subsequently processed using a maximum likelihood (ML) algorithm. The algorithms and implementations are described. Both examples of implementation using the A* (ML) algorithm and a near-ML trellis search algorithm for a time-varying finite state ... 11/29/07 - 20070274200 - Remote band scanning in multipoint-to-point orthogonal frequency division mulitiplexing communication Methods and systems for remote band scanning in multipoint-to-point orthogonal frequency division multiplexing communication are provided. In one embodiment, a method for a remote unit of an orthogonal frequency division multiplexing multipoint-to-point communications system comprises: establishing communication between a first remote unit of a plurality of remote units and a ... 11/29/07 - 20070274199 - Method and system for modifying modulation of power line communications signals for maximizing data throughput rate Data throughput rate in a power line communications (“PLC”) system is controlled by generating PLC carrier signals in accordance with a PLC signal frame structure containing payload symbols where orders of modulation are selected for the individual PLC carriers based on evaluation of at least one of a PLC system ... 11/22/07 - 20070268813 - Method of decoding a spatially multiplexed signal and its corresponding receiver estimating the value of the second symbol s2 to generate an estimated value of the second symbol; calculating an Euclidean distance between the received signal and a noiseless signal defined by the first symbol with said selected value and by the second symbol with said estimated value; selecting the minimal ... 11/22/07 - 20070268812 - Method of configuring wireless resource for effective and efficient transmission in a wireless communication system A method of transmitting a data packet in a orthogonal frequency division multiplexing (OFDM) system is disclosed. More specifically, the method includes receiving feedback information from an access terminal (AT), configuring the data packet for indoor environment or outdoor environment with at least one of variable duration of cyclic prefix ... 11/08/07 - 20070258352 - Subcarrier truncating data transmission scheme in ofdm system A multicarrier data transmission scheme is provided. According to the provided scheme, a radio transmitter encodes data bits with different degrees, the degree of an encoded data bit being defined by the number of parity check equations protecting the data bit. The data bits are preferably encoded with an irregular ... 10/25/07 - 20070248001 - Method and system for forward-looking tone allocation Methods and systems for forward-looking tone allocation are provided. In one embodiment, a method for an orthogonal frequency division multiplexing (OFDM) multipoint-to-point communications system comprises: establishing communication between a plurality of remote units and a host unit, the remote units communicatively coupled to the host in a multipoint-to-point configuration; transmitting ... 10/18/07 - 20070242597 - Scanning by remotes in multipoint-to-point communication using orthogonal frequency division multiplexing Systems and methods for scanning by remotes in multipoint-to-point communication using orthogonal frequency division multiplexing are provided. In one embodiment, a system comprises a host unit; and a plurality of remote units using a multiple access scheme to communicate at the same time with the host unit using orthogonal frequency ... 10/11/07 - 20070237065 - M-ary orthogonal coded/balanced uwb transmitted reference systems A novel transceiver structure is proposed to increase the achievable data rate for ultra wideband transmitted reference (UWB-TR) systems. For every Ns pulse pairs during one symbol transmission, the data pulses are weighted by one of the M-ary orthogonal sequences, thus carrying additional log2 M-bit information. Furthermore, by utilizing a ... 09/27/07 - 20070223359 - Method of ofdma tone interference cancellation An improved method is provided for reducing inter-carrier interference in the CDMA subchannels of hybrid OFDMA-CDMA systems. The results of decoding OFDMA tones are used to at least partially cancel interference from CDMA tones. Then, the CDMA tones are decoded. In specific embodiments, control information is obtained by an initial ... 09/20/07 - 20070217325 - Distributed control in synchronizing remote units to host unit A method for an orthogonal frequency division multiplexing multipoint-to-point communications system is provided. The method includes establishing communication between a first remote unit of a plurality of remote units and a host unit, the plurality of remote units communicatively coupled to the host unit in a multipoint-to-point configuration, transmitting up ... 09/20/07 - 20070217324 - Distributed control in synchronizing remote units to host unit A bi-directional communication system is provided. The system includes a multipoint-to-point host unit and a plurality of remote units communicatively coupled to the multipoint-to-point host unit through an orthogonal frequency division multiplexing waveform. The multipoint-to-point host unit is configured to receive the orthogonal frequency division multiplexing waveform, the orthogonal frequency ... 09/13/07 - 20070211617 - Variable error correction in multipoint-to-point communication using orthogonal frequency division multiplexing Variable error correction for a multipoint-to-point orthogonal frequency division multiplexing (OFDM) system are provided. In one embodiment, a system comprises: a host unit; a plurality of remote units using a multiple access scheme to communicate at the same time with the host unit using OFDM; wherein the host unit allocates ... 09/13/07 - 20070211616 - Resource allocation for shared signaling channels A shared signaling channel can be used in an Orthogonal Frequency Division Multiple Access (OFDMA) communication system to provide signaling, acknowledgement, and power control messages to access terminals within the system. The shared signaling channel may comprise reserved logical resources that can be assigned to subcarriers, OFDM symbols, or combinations ... 09/06/07 - 20070206491 - Distributed control of power in multipoint-to-point orthogonal frequency division multiplexing communication A method for an orthogonal frequency division multiplexing multipoint-to-point communications system is provided. The method includes establishing communication between a first remote unit of a plurality of remote units and a host unit, the plurality of remote units communicatively coupled to the host unit in a multipoint-to-point, multiple access configuration, ... 09/06/07 - 20070206490 - Applying features to packets in the order specified by a selected feature order template Disclosed are, inter alia, methods, apparatus, data structures, computer-readable media, mechanisms, and means for applying features to packets in an order specified by a selected feature order template. By providing multiple feature order templates, a network device manufacturer can provide the user of the network device the ability to select ... 09/06/07 - 20070206489 - Codec integrated circuit, codec and methods for use therewith A codec includes an output module for converting a digital input signal into an analog output signal. A controller module monitors a plurality of status conditions and asserts a mute signal for engaging an output mute switch based on a plurality of disconnect rules. ... 08/30/07 - 20070201347 - Use of guard bands in multipoint-to-point orthgonal frequency division multiplexing communication Systems for use of guard bands in multipoint-to-point orthgonal frequency division multiplexing communication are provided. In one embodiment, an orthogonal frequency division multiplexing (OFDM) system comprises: a host unit; a plurality of remote units using a multiple access scheme to communicate at the same time with the host unit using ... 08/30/07 - 20070201346 - Multipoint-to-point communication using orthgonal frequency division multiplexing and identification codes Systems for multipoint-to-point communication using orthgonal frequency division multiplexing and identification codes are provided. In one embodiment, a system comprises: a host unit; and a plurality of remote units using a multiple access scheme to communicate at the same time with the host unit using orthogonal frequency division multiplexing (OFDM); ... 08/30/07 - 20070201345 - Distributed control of carrier frequency in multipoint-to-point orthogonal frequency division multiplexing communication A bidirectional communication system is provided. The system includes a first remote unit for communicating with a host unit using orthogonal frequency division multiplexing, the host unit communicatively coupled to a plurality of remote units in a multipoint-to-point configuration. The first remote unit is configured to transmit up to a ... 08/30/07 - 20070201344 - Wireless communication apparatus and method A wireless communication apparatus that transmits and receives an orthogonal frequency division multiplexing signal to communicate with a communication counterpart, the wireless communication apparatus including measurement means for measuring the signal level of each subcarrier of the reception signal received from the communication counterpart, calculation means for calculating a predicted ... 08/23/07 - 20070195687 - Symbol alignment in multipoint-to-point orthogonal frequency division multiplexing communication A system is provided. The system includes a host and a plurality of remote units. Upstream bandwidth capacity is shared among a plurality of remote units in a manner that permits at least two of the remote units to transmit to the host at any one time using the upstream ... 08/09/07 - 20070183302 - Interoperability verification for implementation according to communication standard A method for verifying interoperability of an implementation of a communication standard includes verifying the implementation against a standard. A communication stream, generated by an implementation that is interoperable with the standard, will contain expected pilot information. Using the implementation to be verified, a communication stream is generated, containing pilot ... 06/28/07 - 20070147225 - Apparatus and method for estimating frequency offset In a frequency offset estimating device of a subscriber station of a communication system in which a plurality of sectors are allocated to a cell, the frequency offset estimating device extracts a preamble sequence from a downlink frame signal. The frequency offset estimating device estimates a phase offset of a ... 06/21/07 - 20070140100 - New interleaver design with column skip 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 column skip operation and frequency rotation, ... 06/14/07 - 20070133386 - Downlink signal configurating method and device in mobile communication system, and synchronization and cell searching method and device using the same Disclosed is a downlink signal configuring method and device, and synchronization and cell search method and device using the same in a mobile communication system. A downlink frame has plural symbols into which pilot subcarriers are distributively arranged with respect to time and frequency axes. Initial symbol synchronization and initial ... 06/07/07 - 20070127358 - Phase correction in a test receiver The claimed subject matter relates to analyzing performance of a transmitter. This can be accomplished, for instance, through partitioning a super frame into a plurality of segments, and thereafter estimating and correcting phase with respect to at least one of the plurality of segments. Thereafter, additive noise can be determined ... 05/24/07 - 20070115797 - Ofdm modem for transmission of continuous complex numbers The invention enables the transmission of continuous complex numbers using a symbol based transmission scheme such as OFDM. Accordingly, complex numbers are mapped to the constellation map, enabling a fine granularity of constellation points. This scheme may be used, for example, in the transmission of video where the coefficients representing ... 05/24/07 - 20070115796 - Method and apparatus for transmitting/receiving channel quality information in a wireless communication system A method and an apparatus for adaptively transmitting and receiving channel quality information of each AMC sub-band in application of an AMC technology in a broadband OFDM-based system are provided. A speed status of the UE is determined, a determination is made based on a determined speed status whether to ... 05/24/07 - 20070115795 - Frequency division multiple access schemes for wireless communication Techniques for transmitting data using single-carrier frequency division multiple access (SC-FDMA) multiplexing schemes are described. In one aspect, data is sent on sets of adjacent subbands that are offset from one another to achieve frequency diversity. A terminal may be assigned a set of N adjacent subbands that is offset ... 05/17/07 - 20070109953 - Method and apparatus for interleaving \ within a communication system A method and apparatus for interleaving within a communication system is provided herein. More particularly parameters for a convolutional turbo code interleaver are provided, and interleaving takes place utilizing the new parameters. The new parameters generate interleavers that have the correct turbo code behaviors of improving performance with increasing block ... 05/10/07 - 20070104085 - Varying scrambling/ovsf codes within a td-cdma slot to overcome jamming effect by a dominant interferer Scrambling/OVSF codes are varied with a TD-CDMA slot to overcome jamming effects by a dominant interferer. Interference is detected and a scrambling code sequence is varied and employed to multiply a Walsh code assigned to a user device within a transmission time slot. ... 04/26/07 - 20070091785 - Method and apparatus for accelerated super 3g cell search The method and system of a first aspect of the present invention is adapted to perform cell search on all possible bandwidths. In order to reduce the search time, the order in which the allowable BW is used in the search is based on information from history lists. These history ... 04/12/07 - 20070081448 - Partially coherent transmission for a multi-carrier communication system A method and apparatus for performing partially coherent Multiple Input Multiple Output (MIMO) transmissions within a multi-carrier communication system is provided herein. During operation similar information bits enter each base station (401, 402). The information bits are encoded by each base station to produce a plurality of systematic bits and ... 04/05/07 - 20070076583 - Bi-directional communication channel In a unidirectional or broadcasting communication system using OFDM transmission from a base station to subscriber units, a device for achieving a bi-directional channel comprising: A. a transmitter in the subscriber units for transmitting signals that are orthogonal to signals transmitted from the base station and are also orthogonal to ... 04/05/07 - 20070076582 - Radio apparatus and communication system utilizing the same Using as a reference a known signal assigned to one of a plurality of streams that constitute a packet signal, a control unit applies a cyclic timing shift to known signals assigned to the other streams so as to produce packet signals which are to be transmitted finally. While varying ... 04/05/07 - 20070076581 - Radio apparatus and communication system A control unit generates packet signals while controlling an interface (IF) unit, a modulation unit and a baseband processing unit. While dividing each packet signal into a plurality of partial periods, the control unit assigns data to at least part of each of the plurality of partial periods and sets ... 03/22/07 - 20070064586 - Method and system for performing cell selection for ofdm communications A method and apparatus are provided for performing acquisition, synchronization and cell selection within an MIMO-OFDM communication system. A coarse synchronization is performed to determine a searching window. A fine synchronization is then performed by measuring correlations between subsets of signal samples, whose first signal sample lies within the searching ... 03/01/07 - 20070047432 - Apparatus and method for reducing transmission overhead in a broadband wireless communication system An apparatus and method for reducing transmission overhead in a broadband wireless communication system are provided. In a transmitter in a broadband wireless communication system where total time resources are divided according to lengths of transmission data and the transmission data are allocated to the divided time resources, a header ... 03/01/07 - 20070047431 - Radio transmission apparatus and peak power suppression method in multicarrier communication A radio transmission apparatus capable of suppressing peak power without causing deterioration in throughput and degradation in transmission efficiency in multicarrier communication. In this apparatus, a coding section (11) codes transmission data, a modulation section (12) modulates the coded data to generate a symbol, an assigning section (13) assigns the ... 01/25/07 - 20070019537 - Method and system reducing peak to average power ratio (papr) in a communication network A method and system of transmitting a plurality of Orthogonal Frequency Division Multiple (OFDM) symbols in a block transmission system of a communication network is provided. The block transmission system is a frequency reuse system. The method includes encoding the plurality of OFDM symbols. The method further includes, modulating at ... 01/25/07 - 20070019536 - Allocation method, network element, module and user device The invention is related to a network element, comprising: means for receiving feedback information from the user device; means for creating a first orthogonality measure by using the feedback information; means for creating a second orthogonality measure by comparing transmission resources; means for transmitting information to at least one user ... 01/25/07 - 20070019535 - Sdma for wcdma Systems and methodologies are described that facilitate increasing system capacity in a code-limited WCDMA (e.g., TDD, FDD, . . . ) wireless communication environment. According to one aspect, a larger code space can be defined by introducing multiple code clusters within a sector, wherein each cluster has a unique scrambling ... 01/18/07 - 20070014227 - Radio apparatus A modem unit inputs a plurality of combinations, of control signal and data signal, which are to use a plurality of subcarriers. In a plurality of combinations the modem unit adds a first known signal for data signals contained at least in a first combination, and in a plurality of ... 01/11/07 - 20070008874 - User equipment for detecting short codes A receiver employing CDMA techniques estimates background noise based on a periodically updated code. The transmitted signal includes a periodically updated code of a predetermined type and wherein the received signal has CW interference in addition to the transmitted signal. The decision circuit determines if a value representing the likelihood ... 01/11/07 - 20070008873 - Method and apparatus for improving reception in wireless networks subjected to neighboring cells' interferences A method and devices are provided for estimating a signal received at a wireless communication cell along a communication channel where the transmission/reception frequency used for conveying traffic along that communication channel is substantially equal to transmission/reception frequency used for conveying traffic along at least one other communication channel extending ... 01/04/07 - 20070002724 - Apparatus and method for broadcast superposition and cancellation in a multi-carrier wireless network A base station for use in an orthogonal frequency division multiplexing (OFDM) wireless network capable of communicating with a plurality of subscriber stations in a coverage area of the OFDM wireless network. The base station transmits a first OFDM symbol in a first time slot, wherein the first OFDM symbol ... 01/04/07 - 20070002723 - Signaling network id in tps bits Methods and system for transmitting a DVB-H network ID in transmission parameter signaling (TPS) data are described. A sixteen bit DVB-H network ID may be divided into four four-bit portions, and each four-bit portion may be included in an orthogonal frequency division multiplex (OFDM) TPS frame transmitted by the DVB-H ... 12/21/06 - 20060285479 - Apparatus and method for transmitting and receiving pilot signal using multiple antennas in a mobile communication system An apparatus and method are provided for transmitting and receiving a pilot signal using multiple antennas in an OFDM mobile communication system. In the pilot transmitting apparatus, at least one Walsh coverer Walsh-covers a pilot signal to be sent through each of transmit antennas. At least one transmitter allocates the ... 12/21/06 - 20060285478 - Apparatus and method for carrier frequency offset estimation and correction in a wireless communication system A method is disclosed for correcting carrier frequency offset (CFO) in a received data packet that includes one or more M data streams. The data packet has a payload portion preceded by a preamble portion, the payload portion having a plurality of data symbols (L) each of which include a ... 11/30/06 - 20060268673 - Method, apparatus, and system for transmitting and receiving data in a digital broadcasting system using a single frequency network A method, apparatus, and system for transmitting and receiving data in a digital broadcasting system based on Orthogonal Frequency Division Multiplexing (OFDM) are provided. A transmitter frames input bit information in a predetermined bit unit, maps the framed input bit information to a transmitter identification indicator (TII) using a predefined ... 11/30/06 - 20060268672 - Peak power reduction method for wireless communication systems and corresponding transmitter A peak power reduction method for wireless communication systems is proposed in which a constellation shaping is applied on input data symbols in order to reduce the peak power of the signal samples to be transmitted by the communication system. According to the invention, the symbols are modified using functions ... 11/30/06 - 20060268671 - Efficient channel tracking in packet based ofdm systems An OFDM signal transmitted from an OFDM transmitter, the signal having a payload portion comprising a first number of data symbols and a second number of padding symbols such that the combined number of data symbols and padding symbols equates to an integer number of OFDM symbols and wherein the ... 11/09/06 - 20060250935 - Radio communication system and radio communication method A radio communication system for carrying out communications between radio stations by modulating a plurality of signal sequences to be transmitted and received into at least one frequency channel assigned to each of a plurality of cells is formed by a channel mapping means for rearranging for each cell a ... 11/02/06 - 20060245346 - Method and/or system for reduction of papr Embodiments of methods and/or systems for reducing PAPR are disclosed. ... 11/02/06 - 20060245345 - Peak electric power suppressing apparatus and peak electric power suppressing method A peak power suppressing apparatus for suppressing the peak power with simple process without deteriorating the error characteristics of multi-carrier signals. In this apparatus, a modulation section (100) modulates transmission data. A coding section (110) codes the modulated data. An S/P conversion section (120) S/P converts the coded data and ... 10/05/06 - 20060221808 - Ofdm receiving method of ofdm receiver OFDM signals each including a plurality of subcarriers (including data carriers and pilot carriers) orthogonal to each other are received by a plurality of receiver antennas. The received OFDM signals are each OFDM-demodulated into a plurality of receive subcarriers. Based on the plurality of receive subcarriers, the propagation coefficients of ... 10/05/06 - 20060221807 - Multi-carrier transmitter apparatus, multi-carrier receiver apparatus and multi-carrier communication method Multicarrier transmission apparatus 100 receives channel quality information of subcarriers from multicarrier reception apparatus 200 and interleave pattern setting section 108 sets an interleave pattern according to channel quality of subcarriers. Interleaver 106 interleaves I components and/or Q components of symbols using the set interleave pattern. As a result, it ... 09/28/06 - 20060215536 - Method of mapping chips of a spread out symbol to sub-channels of a multi-carrier transmission network The present invention concerns a method of mapping chips of a spread out symbol to sub-channels of a group of sub-channels of a Multi-Carrier transmission channel of a Multi-Carrier transmission network, the spread out symbol being formed by multiplying a data item to be transmitted by elements of a spreading ... 09/21/06 - 20060209667 - Ofdm-mimo communication system using smart spatial symbol mapping and associated methods A transmitter in an OFDM-MIMO wireless communication system uses multiple antennas to transmit each data stream. Before the coded binary bits are mapped into channel symbols, they are divided into two groups. One group is mapped to a channel symbol as in a conventional system. Another group of binary bits ... 09/21/06 - 20060209666 - Method for distributing data on an ofdm time-frequency grid, a base transceiver station, a base station controller and a mobile network therefor The invention concerns a method for distributing data on an OFDM time-frequency grid for data transmission from and to mobile terminals in a mobile network accommodating the use of pilot subgrids suitable for channel estimation, whereby said OFDM time-frequency grid comprises different frequency patterns, subcarrier frequencies of said different frequency ... 08/24/06 - 20060187815 - Parser for multiple data streams in a communication system Techniques to parse data into multiple (M) streams with selectable data rates are described. The modulation scheme and code rate for each stream are determined based on the data rate selected for that stream. The modulation schemes and code rates for all M streams are used to determine a parse ... 08/17/06 - 20060182015 - Ofdm signal receiving apparatus and method for estimating common phase error of ofdm signals using data subcarriers An Orthogonal Frequency Division Multiplexing (OFDM) signal receiving apparatus and method of estimating a common phase error (CPE) using data subcarriers (and pilot subcarriers) instead of only pilot subcarriers. In the OFDM signal receiver, a channel measurement unit estimates a channel from a fast-Fourier-transformed signal to generate information about good ... 07/27/06 - 20060164969 - Method and system for controlling medium access in a wireless network A method and system are disclosed that can be applied to achieve high-throughput in a WLAN. Central to the present invention is the use of an SDMA compatible multi-beam antenna system by a WLAN access point. A system based on two types of antennas-dynamic beam forming and fixed beam antennas—is ... 07/20/06 - 20060159003 - Multiple frequency band operation in wireless networks Embodiments for bandwidth allocation methods, detecting interference with other systems, and/or redeploying in alternate bandwidth are described. Higher bandwidth channels may be deployed at channel boundaries, which are a subset of those for lower bandwidth channels, and may be restricted from overlapping. Interference may be detected on primary, secondary, or ... 07/13/06 - 20060153059 - Signal separation A signal separation method for separation of source signals from a composite signal expresses the composite signal as a series of values of signal amplitude. The source signals have periodicities similar or equal to p. The composite signal is portioned into sections which provide respective rows of a matrix X, ... 07/06/06 - 20060146690 - Methods, circuits and computer program products for estimating frequency domain channel in a dvb-t receiver using transform domain complex filtering A method for performing channel estimation in a receiver of a digital terrestrial television system can be provided by interpolating a complex signal in a frequency domain using a complex filter. The interpolation can be provided, for example, by interpolating, in the time domain, a fast fourier transformed orthogonal frequency ... 07/06/06 - 20060146689 - Method for data transmission by means of a field bus of an automation device A method for transferring data via a field bus FB of an automation system, to which field bus multiple field devices D1, D2, D3, . . . ,Dn, V1, V2, V3, . . . ,Vn are connected. The field bus FB has multiple data channels, to which the field devices ... 06/08/06 - 20060120266 - Apparatus and method for processing digital signal in an ofdma wireless communication system An apparatus and method is provided to process a digital signal in an orthogonal frequency division multiple access (OFDMA) wireless communication system. In the apparatus, a memory stores the number of subcarriers allocated to a mobile terminal and stores an inverse discrete Fourier transform (IDFT) coefficient. A controller outputs a ... 05/25/06 - 20060109780 - Ofdm transmission method, which is intended both for sporadic and for continuous data communication, for a wlan In an OFDM-based transmission method it can be stated for the preamble (4, 7) of a data packet that its N preamble segments (B, {overscore (B)}) are obtained from the segment-by-segment multiplication of an initial segment, which is fixed for all N preamble segments, by a multiplication sequence with a ... 05/18/06 - 20060104195 - Ofdm signal transmission method, and ofdm signal transmitter/receiver In an OFDM transmission scheme, in order to compensate any frequency response variation in time wise resulted from any distortion in a transmission path, out-of-synchronization with passage of time, frequency drift, and phase shift, and to improve a demodulation characteristic, a PS detector 261 in a receiver receiving an OFDM ... 04/27/06 - 20060087961 - Apparatus and method for canceling inter-symbol interference in a broadband wireless communication system An apparatus and method for canceling ISI in a broadband wireless communication system are provided. In a transmitter of the broadband wireless communication system, a controller acquires a CP length, a puncturing pattern, and a time sample interval according to a delay spread. A puncturer punctures coded data in the ... 04/27/06 - 20060087960 - Transmitter and receiver in an orthogonal frequency division multiplexing system using an antenna array and methods thereof A new diversity scheme for orthogonal frequency division multiplexing/multi-input multi-output (OFDM/MIMO) systems. The new diversity scheme, i.e., turbo layered space-frequency coded OFDM (TLSFC-OFDM), uses the turbo principle with space hopping (SH). The TLSFC-OFDM system uses a successive interference cancellation (SIC) algorithm to reduce the number of iterations. As a result, ... 04/13/06 - 20060077885 - Method for spectral side lobe suppression in ofdm-based communication system Of N subcarriers of an OFDM communication system or OFDM based multi-carrier communication system M subcarriers are used as cancellation subcarriers to achieve side lobe suppression of the OFDM transmission signal, where M<N. The M cancellation subcarriers are scaled with a generally complex weighting factor. Determining the weighting factor is ... 04/06/06 - 20060072449 - Method and system for channel equalization Methods and systems for processing signals in a receiver are disclosed herein and may comprise generating at least one channel estimate of a time varying impulse response for at least one of a plurality of received clusters within at least one received signal, where a cluster may comprise an aggregate ... 03/30/06 - 20060067205 - Base station identification method for an fh-ofdma mimo communication system A base station identification method for a frequency hopping-orthogonal frequency division multiple access (FH-OFDMA) based multi-input multi-output (MIMO) communication system that allocates a preamble, a pilot arrangement pattern and a pilot signal pattern per frame to each of base stations. A mobile station identifies a base station using at least ... 03/23/06 - 20060062140 - Transmitting apparatus and transmitting method A control section 101 outputs retransmission information as to whether or not a transmit signal is a retransmission signal, and if a retransmission signal, which (first, second, etc.) retransmission this is, to a selection section 107. An IFFT section 103 performs orthogonal frequency division multiplexing processing of the transmit signal. ... 03/02/06 - 20060045000 - Time-frequency interleaved mc-cdma for quasi-synchronous systems The invention relates to digital transmissions. It particularly relates to a method of transmitting data from a transmitter to a receiver using multi-carrier Code Division Multiple Access (CDMA) for accessing a transmission system. The transmitted data are OFDM modulated using Orthogonal Frequency Division Multiplexing (OFDM) after being spread with a ... 02/23/06 - 20060039270 - Method for pulse shape design for ofdm A computationally efficient pulse shaping method for OFDM that produces mutually orthogonal transmission pulses having fast spectral decay is provided. The pulse shaping method comprises an iterative method for designing OFDM transmission pulses that satisfy prescribed time-frequency localization conditions. The iterative method may be implemented in a computationally efficient way ... 02/09/06 - 20060028977 - Communication device for receiving and transmitting ofdm signals in a wireless communication system The present invention relates to a communication device for receiving and transmitting OFDM signals in a wireless communication system, in which each OFDM signal is composed of a plurality of subcarrier signals each being assigned to a respective transmission channel of said communication system, comprising diversity antenna means including a ... 02/09/06 - 20060028976 - Apparatus and method for transmitting/receiving pilot signal in communication system using ofdm scheme Disclosed is a method for transmitting a reference signal for identification of each cell in a communication system including a plurality of cells each of which is identified by a cell identifier. The method includes receiving a cell identifier, and generating a block code corresponding to the cell identifier using ... 01/12/06 - 20060007848 - System and method for communicating digital information using time-and-frequency-bounded base functions Systems and methods for efficiently conveying one or more broadband communication channels over a transmission medium. Communication is effected by transforming an incoming digital bit stream into a Time-and-Frequency-Bounded (TFB) information stream that includes a plurality of TFB packets. This transformation is accomplished through the use of a plurality of ... 01/05/06 - 20060002286 - Modulator A modulator, and more particularly an HPSK modulator, is disclosed that enables the circuit scale to be reduced and also enables power consumption to be reduced. An HPSK modulator 209 incorporated in a radio communication apparatus or the like is equipped with a spreading code multiplication section 11, a complex ... 12/29/05 - 20050286403 - Method and apparatus for the transmission of data A method and an apparatus for the transmission of data is provided, wherein the data, in a first operating mode, are transmitted in a plurality of first frequency bands and, in a second operating mode, are transmitted in a plurality of second frequency bands. A number of the first frequency ... 12/29/05 - 20050286402 - Method and apparatus for transmitting uplink acknowledgement information in an ofdma communication system A method and apparatus for transmitting uplink acknowledge information (ACK) in a communication system using an orthogonal frequency division multiple access (OFDMA) scheme. The method includes receiving a data bit for the uplink ACK; outputting codewords corresponding to the data bit; performing quadrature phase shift keying (QPSK) modulation on symbols ... 12/01/05 - 20050265218 - Interference suppression for ofdm-based uwb communication . ... // - 1 - ... // - 1 - ... // - 1 - ... // - 1 - ... // - 1 - ... // - 2 - ... // - 1 - ... 11/24/05 - 20050259565 - Radio communication system, radio transmitter and radio receiver A radio transmitter adopting the OFDM scheme is disclosed. The radio transmitter includes an amplitude measuring part for measuring the amplitude of a transmission signal on which inverse Fourier transform has been performed; a power control part for outputting, based on the result of the measurement, control signals each for ... 11/17/05 - 20050254414 - Receiving processing method and apparatus The apparatus includes a receiver unit which receives data; and a guard interval combining unit which combines the whole of the guard interval of the data, which is received by the receiver unit, with the valid symbol. This arrangement makes it possible to efficiently improve reception characteristic by effectively using ... 11/10/05 - 20050249109 - Apparatus and method for improving signal-to-noise ratio in a multi-carrier cdma communication system For use in ause in a multi-carrier CDMA receiver, a noise reduction circuit for improving a signal-to-noise ratio of a multi-carrier signal corresponding to a predetermined sequence of chips. Each chip has a value of Logic 0 or Logic 1. The noise reduction circuit comprises a Fast Fourier Transform (FFT) ... 10/27/05 - 20050237918 - Communication apparatus A communication apparatus in a radio transmission system in which plural first communication apparatuses sends the same transmission signals and a second communication apparatus receives the transmission signals is disclosed. The communication apparatus functions as one of the plural first communication apparatuses, and the communication apparatus includes: a detection part ... 10/13/05 - 20050226141 - Apparatus and method for transmitting/receiving pilot code pattern for identification of base station in communication system using orthogonal frequency division multiplexing scheme Provided are an apparatus and method for transmitting/receiving a pilot code pattern used to identify a base station. In the base station, a pilot code pattern determiner determines a code set that includes a number of spreading codes based on a specific ID of the base station. A first spreader ... 10/13/05 - 20050226140 - Method and apparatus for pilot signal transmission Pilot sequences are constructed from distinct “classes” of chirp sequences that have an optimal cross correlation property. Utilization of chirp sequences for pilot sequences results in pilot sequences that have optimal or nearly-optimal cross correlation and auto-correlation properties. ... 10/13/05 - 20050226139 - Extracting the phase of an ofdm signal sample The disclosed embodiments relate to exploiting circuitry that exists in a typical Orthogonal Frequency Division Multiplexing (OFDM) receiver to find the phase of a complex number corresponding to an input signal without implementing additional costly circuitry or employing a relatively slow inverse tangent look-up table. The magnitude of the complex ... 10/06/05 - 20050219998 - Dynamic zero suffix addition A method of processing a received OFDM symbol is disclosed. The received OFDM symbol has a symbol portion and a zero suffix portion. An information bearing portion of the zero suffix portion that is likely to contain information is determined and is combined with the symbol portion. ... 09/22/05 - 20050207334 - Ofdm communication channel In an OFDM-based receiver, means for achieving time synchronization comprising: A. means for extracting pilot signals contained in the OFDM received signal; B. means for analyzing the pilot signals in the frequency domain and for issuing a signal indicative of a synchronization error in the received signal; C. means for ... 09/22/05 - 20050207333 - Method and apparatus for an enhanced ofdm system A method and apparatus for communicating in an OFDM system whereby subcarriers of the OFDM system are multiplexed between at least a first and a second transmit antenna. The subcarriers are separated between the at least two transmit antennas so that a subcarrier and a mirror subcarrier are not transmitted ... 09/01/05 - 20050190688 - Code generation, in particular for umts digital communications One element in one of several orthogonal OVSF codes with at most 2BM elements is generated dynamically by deriving an intermediate word having (1) B least significant bits identical to the least significant bits in the reverse order of a word representing a code number SF=2B and (2) BM−B most ... 07/28/05 - 20050163038 - Multi-carrier peak reduction using amplitude clipping and phase rotation A hybrid technique for peak-to-average reduction of multi-carrier signals is described. The input to the multi-carrier power amplifier is modified by a hybrid peak-to-average reduction circuit prior to being applied to the amplifier. The hybrid peak-to-average reduction circuit uses two techniques simultaneously. The first technique is amplitude clipping to reduce ... 07/21/05 - 20050157638 - Adaptive puncturing technique for multicarrier systems Various embodiments are described for adaptive puncturing techniques. ... 07/21/05 - 20050157637 - Cell search method for orthogonal frequency division multiplexing based cellular communication system A method for synchronizing and identifying the cell code (scrambling code) of a cell in an orthogonal frequency division multiplexing (OFDM) based cellular communication system is provided. In this method, desired cell is found by utilizing a frame structure of OFDM symbols and through a corresponding cell search procedure, where ... 07/21/05 - 20050157636 - Orthogonal frequency division multiplexing (ofdm) equalizer A novel and simplified orthogonal frequency division multiplexing (OFDM) equalizer uses a coordinate rotation digital computer (CORDIC) to convert the estimated channel effects from rectangular coordinate to polar coordinate and to compensate the phase error with the same CORDIC circuit of synchronization. The OFDM equalizer comprises: a fast Fourier transformer ... 07/14/05 - 20050152263 - Verification of the antenna weights of the base station in a umts mobile radio receiver by use of the viterbi algorithm with fed-back transmission diversity A mobile station sends to the base stations a bit vector which contains weighting factors (w1, w2) for the amplitudes and/or the phases of the signals to be emitted from the antennas. The bit vector is updated by changing one bit position for each time slot, and by transmitting this ... 07/07/05 - 20050147025 - Apparatus and method for estimating a plurality of channels An apparatus for estimating a plurality of channels from a plurality of distinct transmitting points, wherein an input signal includes a super position of signals based on a first pilot sequence transmittable from a first transmitting point and on a second pilot sequence transmittable from a second transmitting point, the ... 07/07/05 - 20050147024 - Communication method in an fh-ofdm cellular system A communication method in an FH-OFDM communication system having a plurality of BSs is provided. A predetermined number of pilot pattern groups are generated, each pilot pattern group having a predetermined number of different pilot patterns for pilot transmission. The pilot patterns in each of the pilot pattern groups are ... 07/07/05 - 20050147023 - Method and apparatus for implementing downlink sdma in a wireless network Methods and structures are disclosed for use in implementing downlink spatial division multiple access (SDMA) in a wireless network. ... 07/07/05 - 20050147022 - Preamble transmit power tailoring system, a method of tailoring preamble transmit power and an ofdm transmitter employing the same A preamble transmit power tailoring system for use with an Orthogonal Frequency Division Multiplexing (OFDM) transmitter, a method of tailoring preamble transmit power, and an OFDM transmitter. In one embodiment, the preamble transmit power tailoring system includes (1) a peak power estimator configured to calculate, based on a payload to ... 06/30/05 - 20050141407 - Multiple-antenna communication systems and methods for communicating in wireless local area networks that include single-antenna communication devices In a wireless local area network (WLAN) that includes high-throughput communication devices with multiple antennas and legacy communication devices with single antennas, training tones are transmitted over a plurality of spatial channels during a first portion of an orthogonal frequency division multiplexed (OFDM) packet-training preamble. The training tones are interspersed ... 06/30/05 - 20050141406 - Quasi-parallel multichannel receivers for wideband orthogonal frequency division multiplexed communications and associated methods A quasi-parallel receiver may simultaneously receive signals within several subchannels that comprise a wideband channel. The receiver includes a subchannel filter selection switch that provides a baseband signal to a selected one of a plurality of subchannel low-pass filters. A heterodyne frequency generator provides one of a plurality of heterodyne ... ### FreshPatents.com Support - Terms & Conditions |