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7173985 |
Method and apparatus for implementing a Viterbi decoder
The Viterbi decoder includes a branch metric processor that determines branch metrics for states of an encoder in a time period. The Viterbi decoder includes a survivor processor that selects...
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7173974 |
Method and apparatus for computing soft decision input metrics to a turbo decoder
A method and apparatus for computing soft decision input metrics to a turbo decoder includes circuits associated with eight-ary phase shift keyed (8PSK) modulation and sixteen-ary quadrature...
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7173555 |
Method and system for nonlinear and affine signal processing
A method of nonlinear and affine signal processing includes the steps of introducing an input signal into a system which exhibits nonlinear behavior, the input signal including a target signal and...
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7173972 |
Decoding system and method for digital communications
A Viterbi decoding system interprets bits in received QAM constellations as many-valued parameters rather than binary valued parameters. It performs the Viterbi algorithm using these many-valued...
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7171608 |
Data playback equipment for playing back data recorded on a disk medium
In playback of data recorded on an optical disk, an error minimization circuit holds a plurality of ideal values for partial response (PR) equalization as equalization targets, and updates tap...
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7170948 |
Method and system of iterative coding/decoding of digital data streams coded by spatio-temporal combinations, in multiple transmission and reception
The invention relates to a method of coding and of decoding a digital data stream coded by spatio-temporal combinations, in multiple transmission and reception. On transmission, the initial stream...
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7168033 |
Parity check matrix and method of forming thereof
A decoder for decoding data from a communication channel includes a parity check matrix including M tiers, wherein M≧B, D min =B*M for M=1 . . . E or B*M≧D min ≧F for M>E. D min is the...
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7167531 |
System and method for shared decoding using a data replay scheme
A system and method are described in which a decoder decodes data from a plurality of data streams. In one embodiment, the decoder is restored to the state it was in the last time it processed data...
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7161994 |
System and method for shared decoding
An apparatus is described comprising: a decoder which decodes a plurality of data streams, the decoder having a state associated with each of the data streams; and state restoration logic to...
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7161995 |
Method and apparatus for Viterbi synchronization
Method and apparatus are described for determining when a convolution decoder is out of synchronization. Normalizations from a convolutional decoder are counted to provide a normalization count,...
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7158589 |
Method and apparatus for parallel decoding of turbo encoded data
A method and apparatus for parallel decoding of turbo encoded data. The method includes multiple Soft In Soft Out (SISO) modules arranged in parallel such that each module supplies an input to one...
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7159167 |
Method and arrangement for enhancing search through trellis
The invention relates to a method and arrangement for enhancing a search through a trellis in a detector ( 220 ) that is arranged at each stage of the trellis to select a certain set of state...
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7154965 |
Soft detection of data symbols in the presence of intersymbol interference and timing error
A method for detecting data symbols corrupted by intersymbol interference and timing error, comprises calculating a first plurality of state probabilities for received symbols using a forward...
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7154964 |
Creating training sequences for space-time diversity arrangements
A training sequence is created for space-time diversity arrangement, having any training sequence length, while limiting the training sequence to a standard constellation. Given a number of channel...
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7155660 |
Detection in the presence of media noise
A signal detector to detect data in an input signal. The signal detector includes a finite impulse response (FIR) filter to equalize the data to a first target length. A Viterbi-like detector is...
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7149262 |
Method and apparatus for enhancing data resolution
A resolution enhancement algorithm is trained on sample images to obtain a polynomial model mapping of low resolution image data to high resolution image data. The polynomial model mapping is...
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7145968 |
Viterbi decoder of partial response maximum likelihood channel
A Viterbi decoder of a partial response maximum likelihood channel. In an optical disc drive, a system of partial response maximum likelihood has an analog/digital converter. This analog/digital...
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7143335 |
Add-compare-select arithmetic unit for Viterbi decoder
An add-compare-select (ACS) arithmetic unit for a Viterbi decoder is provided. The ACS arithmetic unit includes two 2's complement adders for performing an operation on a state metric related to a...
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7142610 |
M-Ary quadrature amplitude modulation (QAM) bit-boundary turbo coded system
A turbo coded communication system includes a gray scale mapper in a transmitter for generating a symbol constellation of modulated signals points that can be separated by boundary lines in the...
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7142611 |
M-Ary phase shift keying (PSK) bit-boundary turbo coded system
A turbo coded communication system includes a gray scale mapper in a transmitter for generating a symbol constellation of modulated signals points that can be separated by boundary lines in the...
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7143013 |
Reliable symbols as a means of improving the performance of information transmission systems
All practical communication channels impose some type of corruption on received data through inter-symbol interference (ISI). ISI corruption is particularly acute in high-order constellation...
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7139335 |
Optimal decision metric approximation in bit-soft decisions
Optimal decision metric approximation in bit-soft decisions. The present invention provides for calculation of the decision metrics/branch metrics for determining whether an incoming analog signal...
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7139336 |
Method and system for channel estimation using iterative estimation and detection
A method and system are directed to enabling a detector to perform relatively accurate channel estimates on blocks of data that include relatively short training sequences in wireless communication...
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7139323 |
Multi-frequency data transmission channel power allocation
A method of controlling a communication device that is operable to transmit digital data over a plurality of frequency channels. The method includes selecting an initial transmission power and a...
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7139337 |
Efficient partial response equalization
A reduced state maximum likelihood sequence estimator allows the use of improved equalization techniques that provides greatly improved performance for channels with severe attenuation and spectral...
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7139334 |
Cooperative code-enhanced multi-user communications system
A cooperative code-enhanced multiuser communications system having a receiver for resolving user ambiguity in a received composite signal by using convolutional encoder state machine properties to...
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7139312 |
System and method for improving coding gain performance within gigabit phy viterbi decoder
A method for improving gain performance of a Viterbi decoder wherein data relating to the best path and a secondary path are stored for the Viterbi decoder. Slicer errors are determined for the...
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7133473 |
Divisionless baseband equalization in symbol modulated communications
Joint equalization and decoding techniques to eliminate the division operations in the Frequency domain Equalizer (FEQ) of an Orthogonal Frequency Division Modulation (OFDM) receiver by...
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7133232 |
Apparatus for recording and regenerating data
In an apparatus for recording and regenerating data, a pass metric is calculated based on a likelihood converted from a previous calculation result iteratively until all pass metrics of the same...
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7133472 |
High-speed turbo decoder
A high-speed turbo decoder using a BCJR (Bahi, Cocke, Jelinek, and Raviv) algorithm or a BCJR algorithm which makes approximation by ACS computation (Add-Compare-Select computation) includes a...
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7130363 |
Apparatus for estimating phase information using matched filter in communication system and method thereof
An apparatus and method for estimating phase information, including a matched filter that outputs converted synchronization signals, based on received data, and converted information of the...
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7131055 |
Fast bit-parallel Viterbi decoder add-compare-select circuit
A Viterbi decoder includes an ACS unit that performs state metric updates for every symbol cycle. State metric updates involve adding the state metrics corresponding to a likely input symbol to the...
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7130588 |
Communication system, base station, and mobile station
A communication system includes mobile stations carrying out transmission at report cycles selected from a group consisting of 0, 1 and other integers without having a relation of a multiple and...
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7131054 |
Apparatus and method for efficient decoder normalization
An apparatus and method are described for normalizing a plurality of state metric values stored in a plurality of accumulators. In one embodiment, normalization logic monitors the each of the state...
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7127666 |
Device and method to carry out a viterbi-algorithm
An apparatus and method for executing a Viterbi algorithm includes initial state registers, at least one transition register, and an adder/subtracter network. Furthermore, evaluation units and a...
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7127009 |
Method of coding/decoding a digital data stream coded with bitwise interleaving in multiple transmission and reception in the presence of intersymbol interference and corresponding system
Method and system for coding/decoding a digital data stream coded with bitwise interleaving in multiple transmission and reception for a radio interface, in which the coding includes subjecting an...
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7123669 |
TPS decoder in an orthogonal frequency division multiplexing receiver
A receiver for orthogonal frequency division multiplexing (OFDM) signals, including an A/D converter for converting received analog signals to a digital signal data stream and an OFDM demodulator...
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7123668 |
Simple detector and method for QPSK symbols
A simplified Viterbi detector for maximum likelihood detection of nine-bit QPSK symbols, employing a difference metric and two comparators, instead of using two state metrics and four comparators....
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7120851 |
Recursive decoder for switching between normalized and non-normalized probability estimates
The present invention relates generally to error-correction coding and, more particularly, to a decoder for concatenated codes, e.g., turbo codes. The present invention provides a decoder for...
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7120213 |
Using SISO decoder feedback to produce symbol probabilities for use in wireless communications that utilize single encoder turbo coding and transmit diversity
An apparatus and method for transmitting and receiving a bit stream. On the transmission side, coded bits (Y t ) and an interleaved version of the coded bits (X t ) are separately modulated and...
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7120207 |
Transmission method and radio receiver
The invention relates to a method and a receiver for obtaining a soft decision in detection of a TFM signal. In the method, the phase of a signal sample is reversed rotated twice in the way that...
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7116504 |
DC-offset compensation loops for magnetic recording system
An apparatus, method, and system for providing dc offset reduction in a communications channel include two or more feedback loops to generate dc offset correction signals, which in turn are...
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7116710 |
Serial concatenation of interleaved convolutional codes forming turbo-like codes
A serial concatenated coder includes an outer coder and an inner coder. The outer coder irregularly repeats bits in a data block according to a degree profile and scrambles the repeated bits. The...
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7116732 |
Method and apparatus for decoding a bit sequence
A method and apparatus are disclosed for decoding according to a Log-MAP algorithm, a bit sequence encoded by a convolutional encoder and received through a noisy channel. A digital signal...
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7113555 |
Data channel with joint data estimation and timing recovery
A data channel includes a data detector that approximates both inter-symbol-interference (ISI) and random timing perturbations using a single finite-state hidden Markov model. The ISI is...
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7113554 |
Turbo decoder system comprising parallel decoders
A turbo decoder system ( 1 ) for decoding turbo coded bits, is provided with a system input ( 2 ) and a plurality of turbo decoders ( 3; 3 - 1, . . . 3 -n) each having a turbo decoder input ( 4; 4...
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7111225 |
Viterbi bit detection method and device
A Viterbi bit detection method for detecting the bit values of bits of a channel data stream stored on a record carrier along an N-dimensional channel tube, N being at least two, of at least two...
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7110923 |
Fast, blind equalization techniques using reliable symbols
A fast equalization technique is disclosed for systems using high-order constellations where symbols have been corrupted by data correlated noise (ISI). The technique permits ISI estimation to...
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7106810 |
Method and apparatus for a demodulator circuit
A method and apparatus for a demodulator circuit in a communication system is described. The invention relates to a demodulator circuit in a communication system using a multi-carrier modulation...
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7103107 |
Demodulator, receiver, and communication system
A demodulator in a receiver has a multiple symbol differential phase detector which calculates phase differences between a received signal and received signals of 1, 2, . . . , N (Where N is an...
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