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Pulse Or Digital Communications > Receivers > Particular Pulse Demodulator Or Detector Particular Pulse Demodulator Or DetectorParticular Pulse Demodulator Or Detector 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.11/15/07 - 20070263752 - Delay-doppler channel response demodulation method and apparatus A wireless communication device uses a time-invariant delay-Doppler channel response estimate for received signal demodulation. The device provides coherent signal demodulation by accounting for frequency and time selectivity in a land-based mobile communication environment, which arise mainly because of delay and Doppler shifts, respectively. In one embodiment, the wireless communication ... 10/25/07 - 20070248191 - Baseband sample selection A receiver receives a signal and samples it at multiple sample points. During a first time interval, a first subset of the multiple sample points are selected for further receiver processing. During a second time interval, a second different subset of the multiple sample points are selected for further receiver ... 10/25/07 - 20070248190 - Iterative decoding with intentional snr/sir reduction The excess signal-to-interference ratio (SIR) or the like of a communication channel is determined by repeatedly decoding received information with successively reduced effective SIR. The step size in an outer power control algorithm, for example a Jump Algorithm, such as that commonly used for transmit power control in communication systems ... 10/18/07 - 20070242780 - Clock adjustment for a handheld audio system A handheld audio system having a radio signal decoder that includes a method for adjusting a system clock. Adjusting the system clock includes receiving a signal at a rate of a receive clock, wherein the signal includes data at a transmit rate. An error term is determined between the receive ... 10/11/07 - 20070237265 - Demodulator and method thereof Methods and apparatuses for demodulating an incoming signal are disclosed. A proposed demodulator includes: a first pulse generator for generating a first control signal according to an incoming signal; a second pulse generator coupled to the first pulse generator for generating a second control signal according to the incoming signal ... 10/04/07 - 20070230629 - Signal detector A signal detector comprises a signal translator, a data signal detector, a clock signal detector and an inputting control circuit for detecting abnormal clock and data signals. The signal translator respectively converts differential data signals and differential clock signal into a single data signal and a single clock signal. The ... 10/04/07 - 20070230628 - Apparatus and method for detecting a signal in a communication system using multiple input multiple output scheme An apparatus is provided for detecting a signal in a communication system using a Multiple Input Multiple Output (MIMO) scheme. The signal detection apparatus includes a detector for generating second matrixes by extending a first matrix composed of channel response vectors, generating specific matrixes by decomposing the second matrixes, generating ... 10/04/07 - 20070230627 - Forward error correction in a distribution system A multimedia distribution system is disclosed. The distribution system includes a transmitter unit that distributes content from a content provider to one or more wireless subscriber units. The transmitter unit includes a decoder configured to determine whether a plurality of incoming packets include one or more erasures, a transmitter configured ... 09/27/07 - 20070223628 - Channel equalizer and method of processing broadcast signal in receiving system A channel equalizer for use in a receiving system includes an overlap unit, a first estimator, an interpolator, and a second estimator. The overlap unit overlaps a group of normal data packets including a head, a body, and a tail, and a known data region is periodically repeated in the ... 09/20/07 - 20070217550 - System having a signal processor for detection of a signal type A system having a signal processor for detection of a signal type of a signal has a processor is disclosed. One embodiment is designed to determine a first variable which is characteristic of a first spectrum element of the signal spectrum, and to determine a second variable which is characteristic ... 09/13/07 - 20070211832 - Apparatus and method for channel estimation for data demodulation in broadband wireless access system Provided is a channel estimation apparatus and method. In the channel estimation apparatus, a channel estimator performs channel estimation onto a received symbol and output a channel estimation result. The channel estimation result is stored in an estimation buffer along with a channel estimation result compensated in a preamble phase ... 09/06/07 - 20070206708 - Channel equalizer and method of processing broadcast signal in receiving system A channel equalizer includes an overlap unit, an estimator, a calculator, a compensator, and a save unit. The overlap unit overlaps a group of data packets in a broadcast signal. The group data packets include a head, a body, and a tail, and a known data sequence is periodically included ... 08/30/07 - 20070201583 - Ethernet channel estimation device and method The apparatus for communication channel estimation device of the present invention includes: a frequency response square computing circuit, to generate a first frequency response corresponding to a first frequency and a second frequency response corresponding to a second frequency according to a input signal, and to square the first and ... 08/16/07 - 20070189424 - Method and apparatus for reduced-state viterbi detection in a read channel of a magnetic recording system A method and apparatus are disclosed for improving the maximum data rate of reduced-state Viterbi detectors with local feedback in magnetic recording systems. A read channel signal is processed in a magnetic recording device by precomputing branch metrics, intersymbol interference estimates or intersymbol interference-free signal estimates for speculative sequences of ... 08/16/07 - 20070189423 - Adaptive thresholding algorithm for the noise due to unknown symbols in correlation based channel impulse response (cir) estimate An impulse response is estimated for a channel by estimating an intermediate impulse response of the channel. The intermediate impulse response comprises at least one multipath spike and one or more non-deterministic noise components at locations throughout the channel Then, a threshold function is applied to the estimated intermediate impulse ... 08/02/07 - 20070177695 - Multi-user detection in cdma systems A natural gradient Blind Multi User Detection (BMUD) network system and method adaptively estimates a set of matrices to counter a linear convolutive environment model. Feedforward and feedback network structures may be implemented, with or without matrix inversion. In other aspects, an adaptive weighting matrix is introduced into a RAKE ... 07/05/07 - 20070153942 - Method and system for decoding single antenna interference cancellation (saic) and redundancy processing adaptation using frame process Aspects of a method and system for decoding single antenna interference cancellation (SAIC) and redundancy processing adaptation using frame process are provided. A receiver may decode video, voice, and/or speech bit sequences based on a first decoding algorithm that may utilize data redundancy and that may impose physical constraints. The ... 06/14/07 - 20070133716 - Digital multimedia broadcasting receiver having improved reception capability and channel estimation method of the same A DMB (digital multimedia broadcasting) receiver is provided, including: an equalizing unit compensating for distortion in CDM (code division multiplexing) channel signals in DMB based on a tap factor; and a channel estimation unit comparing version information contained in individual CDM channel control data in a pilot channel signal in ... 06/07/07 - 20070127602 - Method and system of channel estimation Channel estimation is performed using side information. A signal transmitted over a radio channel includes side information corresponding to a first predetermined signal and a second predetermined signal. The first predetermined signal is different from the second predetermined signal. An estimate of the radio channel is determined using both the ... 05/31/07 - 20070121764 - Frequency error estimation and correction in a saic linear equalizer Different from conventional equalizers, the output of an SAIC (Single Antenna Interference Cancellation) linear equalizer in GSM/EDGE wireless communication systems is a real signal combined from two real FIR (Finite Impulse Response) filter outputs. Each of the FIRs separately uses the real and imaginary components of the ½ π de-rotated ... 05/31/07 - 20070121763 - Computation of soft bits for a turbo decoder in a communication receiver A device (20) for computing a threshold Sthi used in demodulating a quadrature amplitude modulated (QAM) signal to generate a plurality of soft bits per received symbol for input to a turbo decoder, the device including: means (30) for computing the mean amplitude A of the received symbols and multiplying ... 05/24/07 - 20070116156 - Layered modulation for digital signals Signals, systems and methods for transmitting and receiving layered modulation for digital signals are presented. A layered signal for transmitting data, comprises a first signal layer including a first carrier and first signal symbols for a first digital signal transmission and a second signal layer including a second carrier and ... 05/17/07 - 20070110191 - Method and apparatus for normalizing input metric to a channel decoder in a wireless communication system An apparatus and method are provided for normalizing input soft metric to a channel decoder in a wireless communication system. A demapper generates soft metric using an in-phase component (Xk) and a quadrature component (Yk) of a received modulated symbol (Rk), a channel fading coefficient (gk) and a constant value ... 04/26/07 - 20070092043 - Digital broadcasting receiving system and method A digital broadcasting receiving system and method, where the digital broadcasting receiving system includes: a demodulator receiving and demodulating a dual transmission stream including a turbo stream and a normal stream; an equalizer equalizing the demodulated dual transmission stream; a first processor restoring normal stream data from the equalized dual ... 04/26/07 - 20070092042 - Receiver and a receiving method A receiver for receiving transmitted signals comprising reference information known to said receiver, said receiver comprising means for estimating said reference information and non reference information to provide estimated information, said non reference information being at least one of immediately preceding and immediately succeeding said reference information; and means for ... 04/19/07 - 20070086546 - Baseband receiver using transition trigger and method thereof A baseband receiver using a transition trigger and a method thereof are disclosed. The baseband receiver is provided in a radio frequency identification (RFID) reader in order to receive a pulse amplitude modulation (PAM) signal, and can improve a bit error rate (BER) performance by mapping transition waveforms generated whenever ... 03/29/07 - 20070071139 - Channel decoding using hard and soft decisions In one embodiment, the present invention includes a method for receiving channel data via a transmission channel, generating hard and soft decisions for each bit of the channel data in an equalizer, and storing the hard decisions in a first buffer and storing the soft decisions in a second buffer. ... 03/22/07 - 20070064840 - Iterative channel prediction Provided are systems, methods and techniques for predicting a communication channel parameter. In one representative embodiment, values of a communication channel parameter are estimated at a plurality of previous points in time, values are predicted for the communication channel parameter at a plurality of such previous points in time, using ... 03/22/07 - 20070064839 - Power management in digital receivers Methods and systems consistent with the present invention provide a method for dynamically controlling power consumption in a digital demodulator circuit by varying clock rates and bit widths of demodulator components including an analog to digital converter, decimation filter, OFDM operating engine, FEC decoder, and MPE-FEC processor, according to parameters ... 03/15/07 - 20070058757 - Apparatus and method for providing an estimate of a transmit sequence An apparatus for providing an estimate of a transmit sequence from a receive sequence has a processor for processing the receive sequence to obtain a permuted filtered sequence, wherein the processor is operative for processing the receive sequence using channel information and permutation information. The apparatus further comprises means for ... 03/15/07 - 20070058756 - Reduced complexity soft output demapping Method and system for extracting soft estimates of DCM or 16-QAM modulated symbols that are received from a noisy channel. Optimal soft demapping rules are approximated using equations that are division-free and eliminate the need for implementing exponential and logarithmic functions that are inconvenient for hardware implementation. ... 03/01/07 - 20070047675 - Method and apparatus for scaling demodulated symbols for fixed point processing A method and apparatus for scaling demodulated symbols for fixed-point processing are disclosed. Received data are demodulated to generate symbols. The symbols are mapped to soft bits. A signal-to-interference ratio (SIR) is estimated on a current transmission. A scaling factor is then generated for retransmissions based on a ratio of ... 03/01/07 - 20070047674 - Method and apparatus for finding center amplitude of particle size-representative pulses produced by aperture based sizing system Pipelined digital processing circuitry for use with a particle size measurement system, such as that employed in automated hematology systems, measures the ‘center’ amplitude of a pulse produced by a particle or cell passing through a flow cell measurement aperture, such as the detection aperture of a Coulter Principle-based electronic ... 02/22/07 - 20070041477 - Characterizing channel response in a single upstream burst using redundant information from training Characterizing channel response in a single upstream burst using redundant information from training tones (TTs). The invention is operable to utilize inserted TTs, contained within a transmitted data frame, to provide for an improved estimate of a communication channel's actual response and an improved estimate of the noise of the ... 02/22/07 - 20070041476 - Rfid reader Provided are an RFID reader reading data from an RFID tag using a wireless connection over a specified frequency bandwidth, including a transmitting unit synthesizing sequentially and cumulatively frequency control signals generated every clock, mixing the synthesized specific frequency signal and a fixed frequency signal, and as a result outputting ... 02/22/07 - 20070041475 - Iterative mimo receiver using group-wise demapping A STBICM MIMO receiver includes a plurality of demappers for demapping a plurality of complex symbols transmitted by a STBICM MIMO transmitter. Each demapper is configured to have one or more complex symbols associated therewith and is responsible for demapping its associated complex symbols. ... 02/15/07 - 20070036246 - Methods and systems for soft-bit demapping Methods and systems for reconfigurable soft-output bit demapping, reconfigurable for different modes of operation (i.e., different transmitter/receiver configurations) and for different modulation schemes are provided. In an embodiment, a reconfigurable soft-output bit demapping system includes a mode/modulation independent equalizer, a plurality of mode/modulation independent soft-slicers coupled to the outputs of ... 02/15/07 - 20070036245 - Methods and systems for soft-bit demapping Methods and systems for reconfigurable soft-output bit demapping, reconfigurable for different modes of operation (i.e., different transmitter/receiver configurations) and for different modulation schemes are provided. In an embodiment, a reconfigurable soft-output bit demapping system includes a mode/modulation independent equalizer, a plurality of mode/modulation independent soft-slicers coupled to the outputs of ... 02/15/07 - 20070036244 - Look-ahead maximum-likelihood data detector for optical disk drives An apparatus and method for look-ahead data detection are provided, the apparatus including a boundary function generator, a boundary decision unit in signal communication with the boundary function generator, a next state generator in signal communication with the boundary decision unit, and a sample value generator in signal communication with ... 02/15/07 - 20070036243 - Channel estimation using pilot symbols A system for estimating the transfer function of a transmission channel such as the downlink channel in a CDMA system over which a pilot signal and a data signal are transmitted. The system includes at least one estimator for producing first and second channel estimates from the pilot signal and ... 02/08/07 - 20070030928 - Frequency offset cancellation circuit for data determination in wireless communications A demodulating semiconductor integrated circuit device used in a wireless communication system of an FM-modulation scheme, wherein a circuit for canceling a frequency offset is made of a digital circuit, so as to make a high-accuracy decision as to received data and prevent error frequency offset cancel due to a ... 02/08/07 - 20070030927 - Robust frequency offset estimation Methods and apparatus for the correction of Doppler frequency offset in a terrestrial wireless communications system are described, comprising: determining a first estimation of frequency offset f1 in a received signal over a first time period of the received signal; determining a second estimation of frequency offset f2 in a ... 02/08/07 - 20070030926 - Iterative non-coherent cpm decoder The invention relates to a method of non-coherent decoding an encoded CPM signal received by a wireless receiver, and a CPM decoder implementing the method, wherein the signal is generated by a transmitter using a serial concatenation of an outer encoder, an interleaver and an M-ary CPM modulator, and may ... 02/08/07 - 20070030925 - Method and system for determining a log-likelihood ratio (llr) corresponding to each bit of a symbol Methods and systems for determining a Log-Likelihood Ratio (LLR) corresponding to each bit of a symbol are provided. The symbol comprises a predefined number of bits based on a predetermined constellation. The methods and systems include expanding the predetermined constellation. The predetermined constellation comprises a plurality of constellation-points wherein each ... 01/04/07 - 20070002977 - Apparatus and method for scheduling data in a modem A scheduling method is provided for processing data in a communication system. The method includes performing downlink MAP (DL-MAP) decoding; generating a configuration table through the DL-MAP decoding; and processing data in a predetermined unit according to the generated configuration table. ... 01/04/07 - 20070002976 - Method of recording a stream of audio-visual data When a stream of audio-visual data like a television program is recorded (110) with a digital video recorder comprising a compression engine (113) for compressing the stream prior to storage using a variable bit-rate compression technique, the size of the full stream to be stored is unknown. The invention provides ... 12/28/06 - 20060291592 - Multi-symbol noncoherent cpm detector Three receivers are presented for the general case of noncoherent detection of multi-h continuous phase modulation. All three receivers yield performance gains using multi-symbol observations. The first is an existing receiver which has previously been applied to PCM/FM and is now applied to the Advanced Range Telemetry Tier II waveform. ... 12/28/06 - 20060291591 - Estimating bit error probability (bep) in an edge wireless system Distribution parameter mapping determines the bit error probability (BEP) of a burst transmitted from a base station to the mobile station using a modulation and coding scheme (MCS) specified in the EDGE standard. Depending on whether the multi-bit soft decisions of the burst most resemble a Gaussian or a Rician ... 12/21/06 - 20060285613 - Cash dispensing automated banking machine and method An automated banking machine (10) includes at least one of sheet dispensing mechanisms (34, 36, 38, 40, 210). Each sheet dispensing mechanism includes a picking member (72, 212). The picking member rotates, and with each rotation generally causes an end note to be picked from a stack (42, 264) of ... 12/14/06 - 20060280266 - Optimum training sequences for wireless systems 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 that produce zero cross-correlation energy. Channel communication can accordingly be simplified as the zero cross-correlation property allows ... 12/14/06 - 20060280265 - Wireless communication method and apparatus for performing post-detection constellation correction A method and apparatus for correcting the phase and gain of data associated with a constellation pattern of a plurality of received individual symbols. Each symbol is divided into real and imaginary symbol components. The signs of the real and imaginary symbol components of each symbol are determined and used ... 12/07/06 - 20060274860 - Wireless communications apparatus A symbol based communications system involves symbol detection at a receiver in the system. The symbol detection involves determining a set of symbols likely to be present on a sequence of received data. A symbol detector provided to fulfil this role includes means for performing a forward backward recursion means ... 12/07/06 - 20060274859 - Analog-to-digital converter compensation system and method An analog-to-digital converter compensation method includes providing at least one analog tone, converting the analog tone into digital signals, and using the digital signals to generate an error compensation model comprising a plurality of compensation values corresponding to respective digital signals. The compensation values are obtained by applying a time ... 12/07/06 - 20060274858 - Sample rate conversion module and applications thereof A sample rate converter includes an upsampling module, a low pass filter, and a linear sample rate conversion module. The upsampling module is operably coupled up-sample a digital input signal having a first rate to produce a digitally up-sampled signal. The low pass filter is operably coupled to low pass ... 11/30/06 - 20060269016 - Adaptive interpolator for channel estimation A method for channel estimation in a wireless communication system includes the following steps. Channel transfer function is computed at continual and scattered pilot cells using transmitted and received signals at the continual and scattered pilot cells. Time-domain adaptive interpolation is performed to obtain channel transfer function at non-pilot cells ... 11/02/06 - 20060245525 - Power control for a digital broadcast receiving terminal A receiver for a digital broadcast terminal includes first and second receiving units, each for receiving a digital broadcast signal. Each of the first and second receiving units typically includes an antenna, a tuner, and an analog/digital (A/D) converter. The receiver further includes a control unit configured to determine reception ... 11/02/06 - 20060245524 - Radio receiver with a demodulation unit for generating softbits The invention relates to a radio receiver for receiving received signals transmitted by radio. The radio receiver includes a demodulation unit for demodulating the received signals and a first estimating unit for estimating the noise power of the received signals. The demodulation unit outputs the demodulated received signals as softbits ... 10/26/06 - 20060239385 - Method for analysing the channel impluse response of a transmission channel A method is provided for analyzing the channel impulse response of a transmission channel using a time-discrete adaptive equalizer connected in series to the transmission channel, which it equalizes. The method includes determining the IIR filter coefficients (an) of a recursive filter portion and the FIR filter coefficients (bn) of ... 10/19/06 - 20060233286 - Asynchronous servo rro detection employing interpolation A repeatable read-out (RRO) detector employs one or more digital interpolators to interpolate asynchronous sample values that represent RRO data. The asynchronous sample values are read from a recording medium and generated by an A/D converter at a symbol rate, and the interpolators generate interpolated samples at at least one ... 10/19/06 - 20060233285 - Method for channel estimation when using different modulation methods within one signal interval The method is based on a signal interval (DB) which comprises a first part (ET) (which is modulated using a first modulation method (GFSK)) of the signal interval and a second part (which is modulated using a second modulation method (DMPSK)) of the signal interval. The channel parameters (c(i)) relating ... 10/12/06 - 20060227903 - Method of soft bit metric calculation with direct matrix inversion mimo detection A telecommunication MIMO receiver implements soft bit metric calculation with direct matrix inversion MIMO detection. The receiver has a detector that detects data symbols in a received signal by determining distances between received signal points and constellation points; a scaler that scales the distances using a scaling factor; and a ... 10/12/06 - 20060227902 - Method and apparatus for interative noise whitening with causal and anti-causal prediction filters A channel detector has a belief propagation detector, a causal and anti-causal channel output module, and a noise prediction module. The belief propagation detector is coupled to a channel and is adapted to receive a channel output. The belief propagation detector is adapted to generate tentative bit decisions based in ... 10/12/06 - 20060227901 - Apparatus and method for decoding in a hierarchical, modulation system A satellite receiver receives a hierarchical modulation based received signal, which has at least an upper layer (UL) and a lower layer (LL), and simultaneously recovers therefrom data conveyed in the UL signal and data conveyed in the LL signal. ... 10/05/06 - 20060222111 - System for generating a digital signal A system generates a digital signal from input data of a digital pulse. The system includes a converter, a generator, and a comparator. The converter converts the digital pulse to an analytic signal. The converter produces a first output by application of an amplitude envelope and Euler's identity. The generator ... 09/21/06 - 20060209994 - Mld demapping using sub-metrics for soft-output mimo detection and the like A method for detecting a symbol encoded in one or more received signals, wherein the detected symbol corresponds to a combination of values of n components, n>1, comprises (a) for each of a plurality of different combinations of values of the n components, generating a set of two or more ... 09/14/06 - 20060203942 - Method and article of estimating of phase and gain mismatch and corresponding method and device for receiving a digital base band signal The method is for estimating a phase and gain mismatch of a base band digital signal. It comprises: determining (10) weight coefficients depending upon the likelihood of the frequency values of a segment of said base band digital signal; and determining (26) the phase and gain mismatch for the segment ... 09/14/06 - 20060203941 - Method and apparatus to establish for imperfect channel state information at a receiver The system and method utilize design criteria and construction for signal constellations in communication systems, such as cellular telephony, that have imperfect channel state information at the receiver. The system and method assume an imperfect knowledge of fading channel state information (600B) and statistics of channel fading (600D) are used ... 08/31/06 - 20060193404 - Cycle-stealing decoding apparatus, systems, and methods Apparatus and systems, as well as methods and articles, may operate to buffer a state of an iterative decoder operating on a codeword associated with a partially decoded forward error correction-encoded data block, and to restore the state to perform additional decoding iterations on the block during a period when ... 08/31/06 - 20060193403 - Signal processing method and apparatus using bit confidence values In a UMTS/GSM receiver with EDGE services capability, a data sequence incorporating PSK symbols is separated into bits which are assigned confidence values and input to convoluntional decoder (33) to provide improved decoding. ... 08/24/06 - 20060188040 - Data channel with sampling rate less than the channel bit rate Due to code constraints and pickup limitations of optical pickups, much of the signal energy of a binary coded analog signal, and therefore much of the information content, has dissipated at frequencies above about one-half (or even above about one-fourth) of the sampling frequency fs. For example, the response of ... 08/24/06 - 20060188039 - Method and apparatus for performing an n-dimensional gradient search A method and apparatus is presented for performing an n-dimensional gradient search. A state machine is implemented to manage the initial location of the search, increment a counter used to count a search, generate locations (i.e., settings) of the search and the errors associated with the search. The state machine ... 08/17/06 - 20060182204 - Method and apparatus for selecting demodulation processing delays in a receiver A receiver includes a baseband processor for selecting a set of demodulation processing delays for received signal demodulation from a larger set of candidate delays. In one embodiment, the baseband processor selects the set of demodulation processing delays by calculating at least one metric for each demodulation processing delay in ... 08/17/06 - 20060182203 - Block edge effects in iterative diversity reception Methods, apparatuses, and systems are presented for deriving data from a composite signal by processing multiple blocks of symbols, involving (a) receiving a composite signal comprising contributions from a plurality of individual signals transmitted over different paths and representing a common data sequence, (b) calculating soft values of a first ... 08/17/06 - 20060182202 - Iterative diversity reception Methods, apparatuses, and systems are presented for deriving data from a composite signal involving (a) receiving a composite signal comprising contributions from a plurality of individual signals transmitted over different paths, the plurality of individual signals representing a common data sequence, (b) calculating soft values of a first type taking ... 08/03/06 - 20060171488 - Phase advance compensation for mimo time-switch preamble modes A communications receiver is provided that includes a first and second compensators 64 and 68, a pilot tracker 60, and a demodulator 66. The first compensator 64 is operable to adjust an input signal based on both a coarse frequency offset and a fine frequency offset to produce an adjusted ... 07/20/06 - 20060159204 - Method and system for adaptive channel estimation in pilot symbol assisted modulation systems A method includes generating a plurality of noise-averaged channel estimates using noisy channel estimates. At least some of the noise-averaged channel estimates are generated using different averaging lengths. The method also includes selecting one of the averaging lengths based on the plurality of noise-averaged channel estimates. The step of selecting ... 07/20/06 - 20060159203 - Method and apparatus for channel estimation of transmission channels with memory in digital telecommunications systems, and corresponding computer-program product In order to execute, as a function of a received signal (r), a procedure of channel estimation in a transmission channel with memory in a telecommunications system, there is envisaged an operation of estimation of a delay spread associated to said channel, said operation of estimation comprising calculation of a ... 07/06/06 - 20060146962 - Method and device for frame detection and synchronizer The IEEE 802.11a standard uses OFDM, where the transmission is divided into several orthogonal sub-carriers. Here, an algorithm is used for the frame detection; a simplified differentiator obtains an absolute maximum in the differentiated signal at that point where the first plateau in JF(k) starts; a peak detector obtains the ... 06/22/06 - 20060133542 - Methods and apparatus for decoder selection in communication systems Techniques for efficiently choosing a desired decoder in the presence of varying Doppler and/or mobility are disclosed. In one aspect, a method for selecting a filter for decoding forward-link (FL) information in a wireless communication network comprises the acts of decoding reverse-link (RL) information by a plurality of decoders, each ... 06/15/06 - 20060126763 - Processing of a signal representing radiation The invention proposes a method of processing a noisy digital time signal yk corresponding to an initial time signal xt after having been conditioned by a conditioning chain, the said initial signal xt representing information about radiations coming from a radiation source, these radiations having an energy distribution, characterised in ... 06/15/06 - 20060126762 - Method and apparatus for decoding satellite navigation data from a satellite positioning system Method and apparatus for decoding a bitstream of navigation data broadcast by a satellite positioning system satellite is described. In one example, a portion of a subframe in the navigation data for each of a plurality of occurrences of the subframe in the bitstream is obtained at a satellite signal ... 06/15/06 - 20060126761 - Calculation of soft decision values using reliability information of the amplitude A method of decoding a communications signal in a digital communications system, where the communications signal is modulated according to a modulation scheme, such as 16-QAM, including amplitude information. The method comprises the steps of generating (406) a likelihood value for a received communications signal; decoding (408) the communications signal ... 06/01/06 - 20060115022 - System and method for high dynamic acquisition and tracking of signals from the global positioning system A method of acquiring a signal in a high dynamic environment includes generating a first set of acquired signal power values, the first set comprising an acquired signal power value for each Doppler bin in a plurality of Doppler bins over a first predetection integration time (PIT) interval for processing ... 05/25/06 - 20060109935 - Receiver system and method for soft-decision decoding of punctured convolutional codes in a wireless communication system A receiver system of a wireless communication system comprising means for receiving and decoding of punctured convolutional codes and characterized by comprising a soft-decision processing unit adapted to receive a number of quantized signal soft-decision values spread across a range, the range having a maximum value, a minimum value, and ... 05/25/06 - 20060109934 - Method and apparatus to estimate channel tap Briefly, a method an apparatus and a wireless communication device are provided. The wireless communication device includes a receiver to receive complex sequences of symbols. The receiver includes an estimator to estimate one or more channel taps. The estimator includes a memory to store at least a portion of one ... 05/18/06 - 20060104389 - Configurable all-digital coherent demodulator system for spread spectrum applications A configurable all-digital coherent demodulator system for spread spectrum digital communications is disclosed herein. The demodulator system includes an extended and long-code demodulator (ELCD) coupled to a traffic channel demodulator (TCD) and a parameter estimator (PE). The demodulator also includes a pilot assisted correction device (PACD) that is coupled to ... 05/18/06 - 20060104388 - Burst detection apparatus and method for radio frequency receivers The present invention discloses a burst detection apparatus and method. The burst detection apparatus of the present invention comprises a power module, a soft-metric RMS module, and a quality determination module. The bust detection method comprises the following steps: At first, a reciprocal value of the received signal's power is ... 05/18/06 - 20060104387 - Method for estimating time of arrival of received signals for ultra wide band impulse radio systems A method estimates a time of arrival of a signal received in a wireless communication system. An energy in a frame of a received signal is measured to determine a block in the frame, the block representing a coarse time of arrival of the received signal. Multiple time-delayed versions of ... 05/04/06 - 20060093074 - Apparatus and method for estimating a carrier-to-interference-and-noise ratio in a communication system An apparatus and method are provided for estimating a Carrier-to-Interference-and-Noise Ratio (CINR) in a communication system based on Orthogonal Frequency Division Multiplexing (OFDM) or Orthogonal Frequency Division Multiple Access (OFDMA). In the communication system, all base stations boost a power level for a preamble or pilot by B dB. Accordingly, ... 04/27/06 - 20060088132 - Method for demodulating a digital signal based on an estimate of a symbol of the digital signal, and an associated receiver A method for demodulating a received digitally modulated signal subjected to multipath propagation impairment includes estimating the multipath propagation impairment of the received digitally modulated signal using a channel estimator, and estimating at least one symbol of the received digitally modulated signal using a symbol estimator. The at least one ... 04/27/06 - 20060088131 - Slicer apparatus and method for generating slicer output values A method and an apparatus for reducing the area and shortening the critical path of Viterbi circuits in Gigabit Ethernet systems. The present invention replaces the complex four-dimensional Euclidean distance with a simple sum of distances in each dimension as the distance criterion when a slicer is selecting the closest ... 04/13/06 - 20060078074 - Path detection device and path detection method An adjacent sample comparison processing section 201 compares power values between adjacent samples of a delay profile created based on an oversampled received signal and detects whether the power value is increasing or decreasing. A comparison result storage processing section 204 adds 1 when information on an increase/decrease in power ... 03/30/06 - 20060067435 - Semiconductor circuit device A semiconductor circuit device is provided which can attain more stable operations against noise in a data communication system without increasing the power consumption of an overall system, thereby improving the reliability of data communication. For a demodulation baseband signal (S11) obtained by performing digital processing on an output signal ... 03/30/06 - 20060067434 - Method and apparatus for providing iterative timing recovery A method includes the steps of receiving a signal indicative of data bits, and performing per survivor processing-iterative timing recovery (PSP-ITR) on the received signal to generate probabilities of the data bits. To perform PSP-ITR on the received signal, the signal can be processed using a per survivor processing-soft decision ... 03/23/06 - 20060062334 - Method for channel estimation A method of channel estimation is for a receiver to receive signals so as to estimate channel impulse response. The signal consists of a first data burst and a second data burst at least where a first training sequence and a second training sequence are interposed between the first data ... 03/23/06 - 20060062333 - Method and apparatus for channel impulse response estimation in gsm systems A method for estimating channel impulse response (CIR) in a communication system includes converting RF analog signals to obtain baseband digitized signals, sampling the baseband digitized signals according to the symbol period or bit period, cross-correlating at least part of the samples and a predetermined set of training sequence symbols, ... 03/02/06 - 20060045213 - Decoding error correcting codes transmitted through multiple wire twisted pair cables with uneven noise on the wires Decoding error correcting codes transmitted through multiple wire twisted pair cables with uneven noise on the wires. A novel approach is presented by which the metrics may be calculated for signals received over multi-wire (or alternatively referred to as multi-channel, and/or multi-path) communication channels to exploit an uneven distribution of ... 03/02/06 - 20060045212 - Software defined radio system The invention provides a technique that saves rate conversion accompanying complicated calculations and shares an analog filter for anti-aliasing in a sampling device. The sampling device employs an anti-alias filter having a fixed cutoff frequency, an A/D converter and a D/A converter each having a clock signal input, which are ... 02/16/06 - 20060034398 - Reduced complexity sliding window based equalizer Data estimation is performed in a wireless communication system using both oversampling and multiple reception antennas. A receive vector is produced for each antenna at a sampling interval which is a multiple of the chip rate of the received signal. A channel response matrix is produced for each antenna at ... 02/16/06 - 20060034397 - Method and apparatus for transmitting and receiving preamble signal in a wireless communication system Disclosed is an apparatus and a method for transmitting/receiving synchronization mode information in a wireless communication system. A transmission apparatus in the wireless communication system includes a mode information creating unit for creating operation mode information based on a determined utilized bandwidth, and a preamble generating unit for outputting a ... 02/09/06 - 20060029165 - Channel estimation sequence and method of estimating a transmission channel which uses such a channel estimation sequence According to the present invention, the said two complementary sequences (s and g) are extended periodically by extensions (esf, esd and egf, egd) which constitute replicas of their starting part and/or ending part and which are respectively concatenated at the end and/or start of the sequence. The present invention also ... 02/09/06 - 20060029164 - Wired/wireless communication receiver and method for improving performance of equalizer through multipath delay spread estimation A wired/wireless communication receiver includes an equalizer through multipath delay estimation and a signal receiving method. The receiver includes a delay spread estimation unit, a factor updating unit, and an equalizer. The delay spread estimation unit estimates a delay spread value of a received signal and uses a symbol boundary ... 02/09/06 - 20060029163 - Frequency burst detector and related detection method thereof A receiving apparatus for receiving a signal is disclosed. The receiving apparatus includes a first block power calculator for evaluating a plurality of block powers of the signal, a band pass filter for filtering the signal and outputting a specific frequency component of the signal, a second block power calculator ... 02/09/06 - 20060029162 - Modular multi-bit symbol demapper A modular multiple bit symbol demapper (1000) that processes pre-detected symbol values for multiple bit symbols. A symmetry of data bit decisions around higher order data bits is used to iteratively fold, by taking an absolute value (1204, 1208) in the exemplary embodiment, pre-detected values around a lower order bit ... 02/02/06 - 20060023816 - Sliding-window decoder with prolog-windows having flexibel sizes Sliding-window decoders with processor-systems (1) for decoding streams of symbols run prolog deriving processes (23) for deriving initial parameters for prolog-windows, and run main deriving processes (24) for deriving main parameters for main-windows thereby using initial conditions defined by said initial parameters. By introducing defining processes (22) for defining the ... 02/02/06 - 20060023815 - Method for iterative decoder scheduling A method for scheduling a decoding process of coded data blocks transmitted over a link in a communication network. According to the method the coded data block is stored in a queue (71) if all decoders of a cluster (72) of iterative parallel decoders are unavailable. When any of the ... 01/26/06 - 20060018411 - Pilot transmission and channel estimation for multiple transmitters Each transmitter is assigned a time-only pilot code, a frequency-only pilot code, or a time-frequency pilot code to use for pilot transmission. The pilot codes may be pseudo-random, orthogonal, and/or cyclic-shift codes. To obtain a channel estimate for a transmitter using a time-frequency pilot code composed of a time-only code ... 01/26/06 - 20060018410 - Multimode detection In a wireless MIMO system, a multimode detector selects detection mode by channel estimation: ill-conditioned channels trigger use of high performance detection, whereas well-behaved channels lead to low complexity detection. Detection modes typically include maximum likelihood, minimum mean squared error, zero forcing, and so forth. ... 01/19/06 - 20060013343 - Method and system for utilizing space-time and space-frequency codes for multi-input multi-output frequency selective 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 outputs a message signal. The transmitter also includes an encoder that generates a code word in response to the message signal. The code word has a construction ... 01/19/06 - 20060013342 - Method and apparatus for managing buffer for block deinterleaver in a mobile communication system A method and apparatus for managing a deinterleaver buffer comprised of a plurality of sub-buffers in a receiver that performs Reed-Solomon (RS) decoding on a frame received from a transmitter via a wireless network for a mobile communication system including a block interleaver used in the transmitter. The method and ... 01/19/06 - 20060013341 - Wireless communication device and mobile station The occurrence of reception errors due to failure to discriminate between a new transmission and a retransmission is reduced by a wireless communication comprising a storage unit operable to store received data; and a decoding unit operable to obtain a first decoding result by decoding new received data, which is ... 01/19/06 - 20060013340 - Multiple hypothesis channel estimation and prediction for ofdm systems A method of modeling channel parameters in Doppler environments estimates both the channel model and the coefficients simultaneously, thus not requiring additional packet overhead. This adaptive technique refines the channel coefficients as the estimate of the model accuracy improves with channel measurements. The underlying models are very accurate representations of ... 01/05/06 - 20060002493 - Method and device for generating a duty cycle related output signal The invention relates to a method and device for discriminating between defined logic states of a data signal received at at least one receiving unit on the basis of a reference voltage. An output signal relating to a duty cycle of an output signal of the receiving unit dependent on ... 12/29/05 - 20050286657 - Apparatus and method for hybrid decoding Typical communication systems operate with a single channel decoder, and hence would have to settle for the performance from the single channel decoder regardless of the conditions of the communications channel. The present invention uses a hybrid channel decoder comprising multiple channel decoders, each configured to optimize the quality of ... 12/29/05 - 20050286656 - Method to adaptively scale the input to a channel decoder The range R of effective bits (those containing information) within the N output bits from an inner modem is determined and employed to select the M soft bits passed to a channel decoder, thereby avoiding underflow or overflow degrading the channel decoder performance. The average and standard deviation of groups ... 12/22/05 - 20050281357 - Method for the reception of a signal that has undergone a linear precoding and a channel coding, corresponding reception device and computer program product A method for the reception of a data signal which, before being sent, has undergone a linear precoding by means of a unitary preceding matrix, and a channel coding, comprises at least one iteration to improve an estimation of the received signal, as a function of the received signal and ... 12/15/05 - 20050276357 - Correction method for time-varying channel in a time-slot division mobile communication system A correction method for time varying channels in a time slot division mobile communication system that includes: performing channel estimation and signal detection for a time-slot or burst signal received with a time invariant block processing method; estimating the channel deviation by using the detection result of some symbols that ... 12/15/05 - 20050276356 - Method of inverting nearly toeplitz or block toeplitz matrices A method of computing an inversion (X) of a nearly Toeplitz n by n matrix (A). A perturbation matrix (E) is first determined such that the sum of the nearly Toeplitz matrix (A) and the perturbation matrix (E) is a Toeplitz matrix (T). The inversion is then solved for by ... 12/15/05 - 20050276355 - Method and system for channel estimation in a data transmission system Improved techniques for estimating a channel (e.g., channel impulse response) in the time domain are disclosed. The improved techniques can be used to estimate time-domain channel taps in a digital communication system. An improved training sequence enables time-domain estimation and eliminates the need for correct frequency-domain channel estimation at every ... 12/08/05 - 20050271165 - De-modulation of mok (m-ary orthogonal modulation) A system and method for the iterative detection and demodulation of M-ary orthogonal signals (MOK) and signals modulated using Complementary Code Keying (CCK) is described. An important feature of these methods is the good performance of noncoherent detectors in AWGN channels. However, the performance of these detectors in fast fading ... 12/01/05 - 20050265490 - Enhanced channel estimator, method of enhanced channel estimating and an ofdm receiver employing the same The present invention provides an enhanced channel estimator for use with an orthogonal frequency division multiplex (OFDM) receiver employing scattered pilot channel estimates. In one embodiment, the enhanced channel estimator includes a time interpolation estimator configured to provide time-interpolation channel estimates having at least one image for a portion of ... 12/01/05 - 20050265489 - Apparatus and method for estimating a carrier to interference and noise ratio in a communication system An apparatus and a method for estimating a carrier to interference and noise ratio (CINR) in a communication system. The CINR value is precisely estimated by removing the error floor value, which is caused by the inaccurate sliding average window SAW channel estimation value, from the CINR estimation value. Since ... 12/01/05 - 20050265488 - Apparatus and method for recovery symbol timing in the ofdm system An apparatus and method for discriminating an FFT (Fast Fourier Transform) mode and a guard interval mode and detecting the start point of a useful symbol so that a receiver can carry out an FFT operation. The method includes the steps of: detecting a position in which an output value ... 11/17/05 - 20050254604 - Beaulieu series approach to optimal umts rach preamble detection estimation A method for preamble detection in mobile unit to base unit wireless telephony sets a preamble detection threshold based upon a Beaulieu series computation dependent upon preamble correlation data. This preamble detection threshold adjusts for noise by assuming the noise is additive White Gaussian noise (AWGN) with a known variance. ... 11/17/05 - 20050254603 - Reception method for packetized information with automatic repeat request A decoding method is carried out in a receiver configured to accept format information relating to sequences of input data, to use format information in the decoding of each input sequence, and to issue an acknowledgement signal in the event that an input sequence is successfully decoded. The method involves ... 11/10/05 - 20050249317 - Serial self-adaptable transmission line A self-adaptable transmission line (SATL) according to the present invention is implemented as a single signal path coupled between an SATL transmitter and an SATL receiver. The SATL transmitter controls the process of transmission in an SATL architecture. Data to be sent by the SATL transmitter are first encoded to ... 11/03/05 - 20050243951 - Iterative turbo decision feedback receiver Turbo encoded data is received in a wireless communication system. A signal is received including the turbo encoded data. An initial data estimation is performed on the received signal. At least one iteration of turbo decoding is performed on the estimated data. A subsequent data estimation is performed using the ... 10/27/05 - 20050238122 - Data detector system A detector system detects values on a storage medium where there is ISI. The symbols are stored as pits in a close hexagonal lattice having u, v, and x dimensions at mutual 60° separations from an individual pit. The value for a particular symbol is determined by generating an estimate ... 10/20/05 - 20050232379 - Apparatus and method for channel estimation In a channel estimation method, an input signal is received. The input signal is then sliced to obtain a sliced signal. The multiplication of the input signal and the ith delayed sliced signal are accumulated to obtain a cross-correlation value. The energy of the sliced signal is measured. The ith ... 10/20/05 - 20050232378 - Apparatus and method for echo indicator generation An echo indicator generation method, generating an echo indicator to indicate echo levels in a channel response of a transmission channel based on an input signal. The input signal comprises segment sync patterns repeating at intervals transmitted over the transmission channel. The input signal is filtered with a match filter ... 10/20/05 - 20050232377 - Channel estimation in a radio receiver A channel estimation method suitable for use in a CDMA communications system employs a high order interpolation using four interpolation points per slot. Four FIR interpolation filters (18-21) produce a channel estimate for each quarter of a slot by weighting the summed pilots of four slots by amounts related to ... 10/06/05 - 20050220227 - Method and apparatus to detect modulation scheme Briefly, a method and apparatus that may detect a property received signal. The property may be a modulation scheme and/or training sequence and the detection of the property may be done by estimating energy of one or more channel taps outside the range of a channel of the received signal. ... 09/15/05 - 20050201495 - Reproducing apparatus and method for controlling the same A synchronization signal detecting section is internally provided with a stream type counter for counting stream type information output from a header information analyzer and a stream type determining section for instructing, based on a value in the stream type counter, a signal processing section to initiate stream conversion. If ... 09/15/05 - 20050201494 - Apparatus and method for digital down-conversion in a multi-mode wireless terminal A multi-mode digital down-converter for down-converting an incoming IF signal to baseband according to a selected air interface standard. The down-converter comprises a re-configurable gain control block controlled by a first gain parameter for amplifying the incoming IF signal and a mixer stage for down-converting the amplified incoming IF signal ... 09/15/05 - 20050201493 - Single-antenna interference cancellation receiver in time slot communication system A receiver (MST) for use in a modulated communications system wherein data is communicated in a time-slotted format. The receiver comprises circuitry (22) for providing samples of a group of data from the time-slotted format and circuitry (46, 42) for determining a first set of channel estimates in response to ... 09/08/05 - 20050195921 - Receiver, a communication system and a receiving method A receiver (100) in a communication system for detecting a data signal included in a received signal transmitted by a transmitter is disclosed. The receiver comprises a channel estimator (101-1) for estimating a channel and outputting a channel estimation value; an interference signal removing unit (101-2, 101-3) for generating a ... 09/01/05 - 20050190865 - Time encoding and decoding of a signal Analog signals can be fully encoded as an asynchronous time sequence generated by a time encoding machine (TEM). With knowledge of the parameters of the time encoding machine, the asynchronous time sequence can be decoded using a non-linear time decoding machine. In one embodiment, the non-linear time decoding machine generates ... 08/25/05 - 20050185739 - Wlan receiver having an iterative decoder An iterative decoder for use in a WLAN includes an inner decoder/detector, a first subtraction module, a deinterleaving module, an outer decoder, a second subtraction module, an interleaving module, and a determining module. The inner decoder/detector determines inner coded bits and extrinsic information of the inner coded bits from symbol ... 08/25/05 - 20050185738 - Payload based channel estimation of a wireless channel A method for payload-based channel estimation of a wireless channel begins by receiving a frame via the wireless communication channel. The frame includes a training sequence, a frame information section, and a plurality of time sequential data payload sections. As the frame is being received, the method continues by determining ... 08/11/05 - 20050175125 - Ultra-wideband correlating receiver A receiver for ultra-wideband communications is provided. One feature of the receiver architecture is that includes only a single correlator. The receiver may be used in wireless and wire communication mediums. The single correlator may be used to update a locally generated signal based on an incoming signal and detect ... 07/28/05 - 20050163258 - Time filtering for excess delay mitigation in ofdm systems Pilot transmission and channel estimation techniques for an OFDM system with excess delay spread are described. To mitigate the deleterious effects of excess delay spread, time filtering is utilized. Time filtering is utilized to combat excess delay spread effects in channel estimation. The time filtering is performed in the presence ... 07/28/05 - 20050163257 - Channel estimation for a communication system using spectral estimation Techniques for performing channel estimation in a multi-carrier system are described. A frequency response estimate is initially obtained for a wireless channel based on a narrowband pilot sent on different sets of subbands in different symbol periods or a wideband pilot sent on all or most subbands in the system. ... 07/21/05 - 20050157822 - Data detection for a hierarchical coded data transmission Techniques for performing data detection for a hierarchical coded data transmission are described. In one data detection scheme, log-likelihood ratios (LLRs) for code bits of a first data stream are initially derived based on received symbols for the data transmission. The LLRs for the first data stream are decoded to ... 07/14/05 - 20050152478 - Data-aided channel estimation Forming a channel estimate for a communications channel in a communication system, which a receiver that receives over the communications channel signals including pilot symbols, control symbols, and a set of data symbols. A pilot-only based channel estimate is calculated using the pilot symbols in a first pass through a ... 07/07/05 - 20050147189 - Trellis decoder and method of decoding A trellis traceback apparatus and method are disclosed. In one aspect, the apparatus may include a branch indication memory, memory address logic, a selector, and a shift register. The memory may store branch indication information for a state at a section, the information indicating a branch that leads to the ... 06/30/05 - 20050141650 - Deterministic distortion insensitive adaptive receiver using decision updating A technique has been developed whereby an adaptive receiver may employ decision updating in a manner insensitive to RBS. One realization achieves nearly-ideal training of an adaptive equalizer of a modem during TRN1d training despite potential RBS in a digital portion of the PSTN. Updates in the exemplary realization are ... 06/30/05 - 20050141649 - Method and apparatus for estimating channel response and receiver apparatus using the estimated channel response for ofdm radio communication systems An estimation apparatus for estimating a channel response of a radio propagation path using a received signal including a first known signal, comprises a generator which generates a reference signal matrix, a calculator which calculates a generalized inverse matrix of the reference signal matrix including singular values which exceed a ... 06/30/05 - 20050141648 - Time signal peripheral A time signal peripheral may include a radio receiver, decoder/demodulator and time registers. The time signal peripheral may receive, detect and store time information from time signals, e.g., WWV, WWVH, WWVB (USA), JJY (Japan), MSF (UK) and the like. The time information may be used for a self setting clock, ... 06/23/05 - 20050135510 - Decision feedback equalizer and clock and data recovery circuit for high speed applications A method for communicating data includes equalizing received data to reduce channel related distortion in the received data. A clock having frequency and/or phase fixed relative to the equalized data is extracted from the equalized data. The extracted clock is used to clock a retimer to generate recovered data. ... 06/23/05 - 20050135509 - Channel estimation for an ofdm communication system with inactive subbands For channel estimation in a spectrally shaped wireless communication system, an initial frequency response estimate is obtained for a first set of P uniformly spaced subbands (1) based on pilot symbols received on a second set of subbands used for pilot transmission and (2) using extrapolation and/or interpolation, where P ... 06/09/05 - 20050123075 - Efficient conjugate gradient based channel estimator In forming a current channel estimate from a received signal y, the received signal y is decoded to form data s, a convolution matrix Ŝis formed from a first portion of the data s, a matrix F1 is formed from a second portion the data s such that the second ... 06/09/05 - 20050123074 - Efficient conjugate gradient based channel estimator In forming a channel estimate, a received signal y is decoded to form data s, a convolution matrix Ŝ is formed from the data s, a matrix F is formed from the data s such that the matrix F results from the forming of the matrix Ŝ as a convolution ... 06/02/05 - 20050117672 - Method and system for providing low power wlan receiver A method and system for conserving power in a WLAN receiver is provided by a channel estimator for detecting transmitted errors in a transmitted packet and providing equalization for the detected channel errors; a separate pilot processor for detecting off set errors from the channel estimation and providing off set ... ### FreshPatents.com Support |