|
Match
|
Document |
Document Title |
|
|
6993097 |
Demodulation method and demodulator for CPFSK-modulated signals
In a method for estimating a sequence of input data symbols of a CPFSK-modulated data signal transmitted via a faulty channel, in the course of an ACS operation for calculating a transition metric...
|
|
|
6993100 |
Burst detector
A system for detecting a burst in a wireless communications system. A signal strength indicator indicates the strength of an incoming signal representative of incoming packets. A signal strength...
|
|
|
6993098 |
Method and apparatus for efficient calculating distance metric
A method and an apparatus for determining the log-likelihood ratio of a received signal. The log-likelihood ratio is determined by calculating distance between the received symbol and closest...
|
|
|
6993070 |
Method and system of iteratively detecting and decoding received symbols coupled with re-estimation of the coefficients of the transmission channel
In order to detect and iteratively decode encoded and interleaved symbols, prior to any iteration, a linear estimation (A) of the transmission channel Ĥ (z) 1 is run on the basis of specific...
|
|
|
6980607 |
Method for decoding a data signal
A turbo decoder is used in a method for blockwise decoding a data signal that is error protection coded at a transmitter and that is detected in a receiver. The turbo decoder includes two feedback...
|
|
|
6980609 |
Matched filter, filtering method and digital broadcast receiver using the same
A digital passband matched filter is automatically adapted to a carrier wave ω in accordance with a frequency offset of the carrier wave, to obtain a passband digital signal having no frequency...
|
|
|
6980606 |
Device for reconstructing a runlength constrained sequence
A branch metric calculation unit calculates a set of branch metric values for subsequent samples of the sampled input signal. Each of the set of branch metric values is an indication for the...
|
|
|
6977972 |
Method of hybrid soft/hard decision demodulation of signals with multilevel modulation
The performance of forward error correction decoders for digital communication systems can be improved if soft information relating the reliability of the value representing the demodulated signal...
|
|
|
6975839 |
Apparatus, and associated method, for estimating frequency offset using filtered, down-sampled likelihood polynomials
Apparatus, and an associated method, for facilitating frequency offset estimation between communication stations operable in a communication system. A likelihood polynomial is calculated and...
|
|
|
6975692 |
Scaling of demodulated data in an interleaver memory
In a method of demodulating and decoding an encoded interleaved signal, a received encoded interleaved signal is demodulated, thereby producing soft-decision demodulated output words. Thereafter,...
|
|
|
6973143 |
Soft-normalizer for a channel decoder
The invention proposes a device for generating, from incoming signal values (X i,n ), soft-values (Y i,n ) to be input into a channel decoder of a communication device for use in a wireless...
|
|
|
6970522 |
Data retrieval
A digital data storage (DDS) system for reading DDS tapes employs a partial response maximum likelihood detection system which utilises redundancy in the 8-10 DC free modulation encoding to reduce...
|
|
|
6970520 |
Methods and systems for accumulating metrics generated by a sequence estimation algorithm
Radiocommunication systems, methods and terminals are described wherein metrics associated with MLSE detecting techniques, e.g., using the Viterbi algorithm, are accumulated in a manner which is...
|
|
|
6967598 |
Reduced complexity multi-turbo multi-user detector
A reduced complexity Turbo multi-user detector (MUD) processing system in multiple access communications channels that decreases the likelihood of improper decoding of the final values of interest...
|
|
|
6968023 |
Interference signal canceling apparatus and interference signal canceling method
Respective threshold value judging units 108 - 1 through 108 - n compare the likelihoods calculated by the corresponding likelihood calculators 106 - 1 through 106 - n with threshold values...
|
|
|
6965652 |
Address generator for LDPC encoder and decoder and method thereof
A data transmission system is provided for transmitting user data to and receiving data from a communication channel, comprising a first address generator to generate a first address in accordance...
|
|
|
6963625 |
Dada decoding
An arrangement for selecting the largest of a plurality of input currents (pma (k−1), pmb (k−1)) and adding a further current (Ibmk) to the selected current, the arrangement comprising: a...
|
|
|
6961387 |
Apparatus and method for coding/decoding optimal (11,5) codeword in a mobile communication system
An apparatus encodes an input information bit stream comprised of 5 bits into a (11,5) codeword comprised of 11 coded symbols. The apparatus comprises a Reed-Muller encoder for encoding the input...
|
|
|
6961392 |
Joint equalization and decoding using a search-based decoding algorithm
A method and apparatus for joint equalization and decoding using a search-based decoding algorithm on a channel exhibiting intersymbol interference distortion is described. A sequence of...
|
|
|
6961391 |
Signal processor used for symbol recovery and methods therein
A signal processor and method therein that is arranged and constructed to recover a sequence of symbols from a received signal is discussed. The processor includes a symbol selector for selecting a...
|
|
|
6959057 |
Method of enhancing signal tracking in global positioning system receivers
A method of enhancing signal tracking in a global positioning system receiver utilizing a frequency banked filter in providing code and carrier tracking loops includes acquiring a continuous time...
|
|
|
6956815 |
Method and apparatus using pseudo-inverses of linear transformations in multi-carrier modulation receivers and transceivers
Many communications protocols involve a collection of communication channels collectively forming the dimensions of a finite dimensional vector space, of which at any point in time, only a subset...
|
|
|
6956912 |
Turbo decoder with circular redundancy code signature comparison
An iterative turbo decoder and method for error correcting communication signal data are provided. The decoder implements a stopping rule through use of signature codes to determine whether...
|
|
|
6954507 |
Method for estimating the bit error rate in a radio receiver and corresponding radio receiver
In a radio receiver, an equalizer generates reliability information in the form of soft decision information indicating probabilities that a data symbol received by the radio receiver is based on a...
|
|
|
6954482 |
Soft-decision trellis-coded differential frequency-hopped spread spectrum (DFHSS)
A method and system begin at a random node of a trellis model having a set of at least two axes, wherein one axis corresponds to time and a second axis corresponds to frequency, a set of M states,...
|
|
|
6952457 |
Method and system for adapting a training period in a turbo decoding device
A method of processing an information sequence with a decoder is provided. A window within the information sequence is selected. A training period is calculated for the window. At least one...
|
|
|
6952458 |
Demapping system and method
A demapping system and method for demapping symbols into bits, is provided. An embodiment of the system comprises a processor, and a memory that is coupled to the processor. The memory comprises a...
|
|
|
6950476 |
Apparatus and method for performing SISO decoding
A device and method for performing SISO decoding. The method comprising the steps of: (a) providing a trellis representative of an output of a convolutional encoder, the convolutional encoder has a...
|
|
|
6947503 |
Method and circuit for synchronizing a receiver for a convolutionally coded reception signal
A method for synchronizing a receiver for a convolutionally coded reception signal having a sequence of received data symbols includes decoding the convolutionally coded reception signal by means...
|
|
|
6947506 |
Method and apparatus for improved turbo multiuser detector
A multi-user turbo decoder combining multi-user detection and forward error correction decoding is disclosed that utilizes iterative decoding of received, interfering signals, and the construction...
|
|
|
6944206 |
Rate one coding and decoding methods and systems
Methods and systems are provided for communicating encoded data. L received encoded signal values including soft information are received and transformed to L data symbols. In various embodiments,...
|
|
|
6944234 |
Coding method and apparatus for reducing number of state transition paths in a communication system
A communication system is composed of an encoder encoding an input sequence to sequentially generate output codes X 0 , X 1 , . . . , and a decoder decoding the output codes by a MLSD (Maximum...
|
|
|
6944242 |
Apparatus for and method of converting soft symbol information to soft bit information
An apparatus for and method of converting soft symbol decision information into soft bit decision information that overcomes the disadvantages of the prior art. The invention is adapted to receive...
|
|
|
6944235 |
SYSTEM AND METHOD OF DATA COMMUNICATION USING TRELLIS CODED MODULATION OR TURBO TRELLIS CODED MODULATION IN COMBINATION WITH CONSTELLATION SHAPING WITH OR WITHOUT PRECODING WHEN USING CONCATENATED CODING SCHEMES OR WHEN WORKING IN A NON-ERROR FREE OPERATION POINT
A technique that combines either a trellis coded modulation (TCM) coding scheme or a turbo trellis coded modulation (TTCM) coding scheme with constellation shaping and precoding schemes, and...
|
|
|
6940929 |
Low-latency high-speed trellis decoder
A method for decoding a word received at a current time instant into a symbol of a trellis code. The trellis code corresponds to a trellis diagram having N states associated with the current time...
|
|
|
6940928 |
Method and apparatus for soft-in soft-out turbo code decoder
Method and apparatus for Soft In Soft Out Turbo Code Decoder. Metrics are received by a decoder having SISO unit(s). The SISO unit computes all the alpha values corresponding to a block of data. Of...
|
|
|
6937684 |
Phase discriminator with a phase compensation circuit
A differential phase discriminator includes a phase compensation circuit to compensate for timing drift and error for recovering timing information in a digital phase lock loop. The differential...
|
|
|
6934343 |
Computing the full path metric in viterbi decoding
By utilizing an additional counter and monitoring the maximum state metric at each stage, only forward progressing modulo wrap-arounds will occur and these can be counted. After decoding this count...
|
|
|
6931585 |
Detection in the presence of media noise
A signal detector to detect data in an input signal. The signal detector includes a Viterbi-like detector to generate a most likely path corresponding to the data in the input signal. A linear...
|
|
|
6928125 |
Recording state detection system for use in a disk drive
A recording state detection system includes a Viterbi detection unit, an error calculation unit for calculating error data series representing a difference between each sample data of the...
|
|
|
6928599 |
Method and apparatus for decoding data
Decoding an encoded block of data is accomplished by partitioning the block into a first and a second sub-block and performing forward and backward iterative calculations on the sub-blocks in...
|
|
|
6928267 |
Estimating an indicator for a communication path
The present invention relates to estimation of a network indicator of a communication path between a first station and a second station in a communication system. A first indicator of the...
|
|
|
6925592 |
Turbo decoder, turbo encoder and radio base station with turbo decoder and turbo encoder
In an interleaver for use in a turbo decoder, a deinterleaver, or an interleaver for use in a turbo encoder, an offset is set based on previously determined thresholds in accordance with symbol...
|
|
|
6925107 |
Decoding method and decoding device for a CDMA transmission system for demodulating a received signal available in serial code concatenation
A method and a device for decoding for use in a code-division multiple access (CDMA) transmission system for demodulating a received signal available in serial code concatenation, with a two-step...
|
|
|
6922446 |
Digital transmission system, decoder and decoding method
A digital transmission system utilizing data coding at the transmitter and data decoding at the receiver, the decoding being iterative, reliability data about soft decisions being calculated for...
|
|
|
6917655 |
Coding and decoding a signal modified in accordance with the feedback states of an encoder
A data encoding system includes a modifier, an encoder, and a feedback. The modifier receives a first data stream and modifies the first data stream so as to provide a second data stream. The...
|
|
|
6914948 |
Media noise post-processor with varying threshold
A post-processing method and circuit ( 30 ) for correcting media noise errors and producing a corrected recovered data output signal ( 49 ) is disclosed for use in a sampled data read channel of a...
|
|
|
6904559 |
Error correction method in full response read channels
The present invention provides an error correction method that is used in full response read channels. This method includes the steps of: obtaining a read signal from a storage medium and...
|
|
|
6904105 |
Method and implemention of a traceback-free parallel viterbi decoder
The traceback operation for a Viterbi algorithm can be minimized by producing optimal path values for each state in the trellis, and updating the optimal path values at each state for each symbol....
|
|
|
6904097 |
Method and apparatus for adaptive signaling in a QAM communication system
A method and apparatus to adaptively puncture bits within QAM modulated data symbols transmitted in a communication system in order to effect a signaling channel. The method and apparatus utilize...
|