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7315427 |
Method for checking the quality of servo Gray codes
A dynamic threshold detector for a magnetic storage medium comprises a transition detector that receives the data comprising pairs of numbers based on data received from the magnetic storage...
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7313206 |
Modified branch metrics for processing soft decisions to account for phase noise impact on cluster variance
Modified branch metrics for processing bit-soft decisions to account for phase noise impact on cluster variance (CV). The present invention is able to partition a modulation scheme's constellation...
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7313750 |
Efficient soft decision demapper to minimize viterbi decoder complexity
A receiver system that receives signals and has a demapper device that is responsive to an equalizer output and generates a demapper output including one or more bit metrics. The receiver system...
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7308061 |
Read channel apparatus and method for an optical storage system
A read channel apparatus is disclosed for reading data recorded on an optical storage system at a predetermined baud rate. The apparatus asynchronously samples an analog read signal generating from...
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7308049 |
Method and apparatus for noncoherent signal processing in pilotless wireless systems
Methods, apparatus and systems for implementing an algorithm for N-symbol noncoherent processing of M-ary DPSK signals in a pilotless, wireless system is provided. The algorithm is carried out with...
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7308640 |
Low-latency architectures for high-throughput Viterbi decoders
Digital circuits and methods for designing digital circuits are presented. More particularly, the present invention relates to error correction circuits and methods in communications and other...
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7305055 |
Search-efficient MIMO trellis decoder
A decoder generates distance and label metrics associated with each label of a coset transmitted in a multi-input multi-output communication system having M t transmit antennas and M r receive...
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7302233 |
Multiuser detection for wireless communications systems in the presence of interference
System and method for detecting transmissions from multiple users in a digital wireless communications system in the presence of interference. A preferred embodiment comprises derotating a received...
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7302019 |
Maximum likelihood decoding method and maximum likelihood decoder
A maximum likelihood decoder includes metric generators for generating metrics based on a plurality of partial responses and a Viterbi decoder for realizing maximum likelihood decoding by using a...
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7302017 |
System and method for adaptive matched filter signal parameter measurement
A robust and flexible system for signal parameter measurements in the field of signal processing dynamically uses signal parameters from previous signal detections and parametric priorities to...
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7298786 |
VSB transmission system
A vestigial sideband (VSB) modulation transmission system and a method for encoding an input signal in the system are disclosed. According to the present invention, the VSB transmission system...
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7298798 |
Method and system for decoding block codes
A method and system are disclosed for decoding block codes using a single decoder and trellis diagram. The signal can include at least one block code, and the block code can be modulated using at...
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7295622 |
System and method for information decoding using batched processing of independent parameters
System and method for decoding received information using batched processing of independent parameters. A preferred embodiment comprises a decoder (for example, decoder 210 ) with a memory (for...
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7292658 |
Method and device for efficient decoding of symbols transmitted in a MIMO telecommunication system
A method for decoding at least one signal transmitted by means of at least one antenna and received by means of at least one antenna, which method includes a symbol decoding step for producing at...
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7293225 |
Method and arrangement for decoding using a trellis
A method and arrangement for performing Viterbi decoding by means of a trellis is provided. According to one embodiment, the arrangement comprises one or more ACS units. Connections between the...
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7290927 |
Method and device for convolutive encoding and transmission by packets of a digital data series flow, and corresponding decoding method and device
A method for convolutive encoding process and transmission by packets of a digital data series in which a set of successive n=K−1 bits are discriminated to form a current word of n bits. A stable...
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7292650 |
OFDM receiver and metric generator thereof
A metric generation scheme for use in OFDM receivers. In a preferred embodiment, an OFDM receiver of the invention includes a dynamic quantizer to compress a series of channel-state information...
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7289579 |
Information reproducing apparatus using maximum likelihood decoding method
An apparatus is provided in which a parameter of Viterbi decoding is adjusted on the basis of a metric difference for evaluation of PRML signal quality to increase the error rate even when using a...
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7289569 |
HDTV trellis decoder architecture
A trellis decoding system for use in processing a High Definition Television signal. The trellis decoding system includes a traceback unit that identifies a sequence of antecedent trellis states in...
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7286506 |
Method and apparatus for pilot estimation using a prediction error method with a kalman filter and a Gauss-Newton algorithm
A system is disclosed for use in a wireless communication system to provide an estimated pilot signal. The system includes a receiver and a front-end processing and despreading component in...
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7283593 |
Distance determinations associated with a trellis decoder
According to some embodiments, distances associated with a Trellis decoder are determined.
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7277508 |
Method of decoding a turbo-code encoded signal in a receiver and corresponding receiver
A method is provided for decoding a turbo-code encoded signal in a receiver. According to the method, the signal is received from a transmission channel, and the signal is digitally turbo-code...
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7277507 |
Viterbi decoder
A Viterbi decoder capable of supporting a variety of constraint lengths and any arbitrary number of coefficients of a given estimated transmission path and composed of special hardware of small...
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7278089 |
System and method for error detection in encoded digital data
A receiver is to receive an encoded data block that was encoded using a convolutional encoder and includes source bits and error detection bits. The receiver may include a Viterbi decoder, a...
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7277498 |
Mapping method of code word with QAM modulation
In the code word mapping operation of a radio communication system, mapping patterns are provided for different S/N ratios, the code word bits produced from a coder are not equally assigned to...
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7277472 |
Estimation method of flat fading channel in CDMA communication system and apparatus for the same
The invention provides a method and apparatus for estimating flat fading channel in CDMA communication system, said method is implemented by using an adaptive forward prediction technique based on...
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7277506 |
Maximum likelihood sequence estimator which computes branch metrics in real time
An improved method and apparatus for Viterbi Algorithm calculations for maximum likelihood sequence estimators in communication receivers is disclosed. The calculations for the maximum likelihood...
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7277496 |
Device, system and method for blind format detection
Device, systems, and methods to detect unknown transmission formats are provided. Viterbi metric values may be calculated for a plurality of possible format parameters for a transmission format....
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7278088 |
Configurable architecture and its implementation of viterbi decorder
The present invention relates to a re-configurable Viterbi decoder. By re-setting the values of some registers, the inside control path and data path of the Viterbi decoder can be appropriately...
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7274681 |
Method of multiplexing information in mobile communications, method and apparatus for decoding transport format combination indicator, and mobile station apparatus, base station apparatus and mobile communication system
Control information, which is transmitted through a circuit different from the one used for the transmission of a plurality of pieces of information to be multiplexed, is analyzed. When the...
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7272771 |
Noise and quality detector for use with turbo coded signals
In one aspect this invention provides a method to operate a decoder, and a decoder that operates in accordance with the method. The method includes monitoring, during operation of the decoder on a...
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7272198 |
Method and apparatus for complementary code keying
A method of decoding data includes receiving a symbol and determining a data rate that was used to encode the symbol. A set of correlator output signals are generated based on a first mode when a...
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7269226 |
Data processing method
A suboptimal method for searching for a symbol sequence, the method comprising the steps of: determining a channel impulse response; sampling a received signal; selecting at least one of the...
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7269227 |
Apparatus and method for calculating bit metrics in data receivers
An apparatus and method for calculating bit metrics in data receivers. The apparatus of the invention includes a storage unit and a calculator. The storage unit is configured to store a number of...
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7263141 |
Code mapping in a trellis decoder
A trellis decoder system uses a feed-forward trellis demapping configuration to prevent error propagation. In a system for processing encoded binary data symbols representable as a symbol...
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7263652 |
Maximum likelihood detector and/or decoder
A maximum likelihood detector receiving a data stream corresponding to ideal values which may include noise, and outputting information specifying a sequence of states of maximum likelihood...
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7260768 |
Communication device and communication method
A communication device is provided with a turbo encoder ( 1 ) which carries out a turbo encoding process on the lower two bits of transmission data so as to output information bits of two bits and...
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7260154 |
Method and apparatus for implementing a multiple constraint length Viterbi decoder
A Viterbi decoder capable of decoding a code having a maximum constraint length of L max is disclosed. The Viterbi decoder includes an initializer unit that initializes selected states of an...
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7260160 |
Method and apparatus for decoding GPS satellite data at low signal to noise levels
A method of decoding a received phase modulated carrier signal comprising the following steps: (A) computing a total probability of a current data bit being “one” or “zero” at a time epoch...
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7257174 |
Method for processing a digital input signal of a channel equalizer
A baseband digital signal block is processed at an output of a matched filter and at an input of a channel equalizer. This signal is fed to a whitening filter estimated for the block by taking into...
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7257172 |
Signal processing device utilizing partial response maximum likelihood detection
A partial response (PR) waveform generator generates a digital value sequence of an expected PR waveform based on the output of a soft-decision Viterbi detector included in, for example, a...
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7254190 |
Satellite receiver
Systems and techniques for receiving a satellite signal wherein the signal is demodulated and iterative decoded. It is emphasized that this abstract is provided to comply with the rules requiring...
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7251283 |
Timing offset compensation in orthogonal frequency division multiplexing systems
A robust timing offset compensation scheme for multi-carrier systems. According to the invention, a timing offset compensator is provided to compensate a current symbol in the frequency domain for...
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7251300 |
Method and apparatus for frequency tracking based on recovered data
A method of frequency tracking based on recovered data, for use in an automatic frequency control subsystem at the receiver of a mobile station, is disclosed. The frequency tracking mechanism...
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7251299 |
Time delay estimator
A system for time delay estimation in a discrete time processing system includes a cross correlator that performs cross correlation on a first signal and a second signal, and provides a cross...
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7248849 |
Frequency domain training of prefilters for receivers
A prefilter is trained as follows. The frequency response B of a conditioned channel is determined without reference to the prefilter, and the frequency response W of the prefilter is computed from...
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7248637 |
Viterbi decoder utilizing partial backtracing
A Viterbi decoder is configured for outputting a prescribed plural number of decoded bit pairs upon execution of each backtracing operation based on accessing a second prescribed number of state...
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7248651 |
Low complexity high performance decoder and method of decoding for communications systems using multidimensional signaling
A reduced search space minimum distance decoding algorithm provides average probability of error performance close to that of optimal MAP decoding. The decoding algorithm provides dramatic...
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7248650 |
Hardware implementation of maximum likelihood sequence estimation for wireless receivers
A coding/decoding trellis structure circuit included in a maximum likelihood sequence estimator (MLSE) sub-receiver having one or more distance calculation units (distus) responsive to equalized...
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7246297 |
Time-invariant hybrid iterative decoders
An iterative decoder for receiving a sequence of samples representing a series of symbols, and for decoding the received sequence to the series. The decoder includes a plurality of variable-nodes....
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