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7042938 |
Soft bit computation for a reduced state equalizer
Method and apparatus for soft bit computation with a reduced state equalizer. The method assures that the number of states in the equalizer is reduced to obtain acceptable complexity, while also...
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7042964 |
Viterbi decoder, method and unit therefor
A Viterbi decoder includes a number of classical Add-Compare-Select units and a number of further Add-Compare-Select unit having a lower complexity butterfly unit ( 300 ) having only two adder...
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7042963 |
Methods and apparatus for decoding variably-coded signals based on prior communication
A signal representing variably coded information, i.e., information that is coded according to a code selected from a set of codes, is received at a first station. The received signal is decoding...
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7043678 |
Method for identifying bad frames
The present invention discloses a method and device for identifying unusable data blocks (bad frames) during communication in a network. The method comprises the steps of determining (S 1 ) a...
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7039855 |
Decision function generator for a Viterbi decoder
A decision function generator for a Viterbi decoder includes a compressor module for receiving arguments of a decision function and for evaluating functions of the arguments of the decision...
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7039364 |
Method for performing measurements in a wireless terminal and a wireless terminal
The invention relates to a method for performing measurements in a wireless terminal comprising a receiver for receiving radio frequency signals, means for taking samples from the received signals...
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7035327 |
Adaptive equalizer for use in information reproducing apparatus
Hold registers receive a hold register enable signal. When reading one kind signal of header field data, the hold register enable signal is High and the registers store newly renewed values of...
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7035356 |
Efficient method for traceback decoding of trellis (Viterbi) codes
Methods and apparatus are provided for efficiently implementing a traceback decoding of Viterbi codes. A Viterbi decoder circuit having at least two data selection blocks and at least two trace...
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7035354 |
CDMA multi-user detection with a real symbol constellation
A method for multi-user detection includes receiving a complex input signal due to a superposition of waveforms encoding symbols in a real-valued constellation, which are transmitted respectively...
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7035343 |
Closed loop transmit diversity antenna verification using trellis decoding
A trellis decoder determines the most likely transmitted phase in response to previously requested phase adjustments and observed transmitted symbols. Maximum a posteriori (MAP) decoding also may...
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7035347 |
Combining direct interference estimation and decoder metrics for improved measurement for AMR mode adaptation in GSM systems
A method of combining a channel quality estimate for the radio channel based on direct measurement of carrier and interferer energies, and a channel quality estimate for the radio channel based on...
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7031407 |
Apparatus and method for decoding and trace back of convolution codes using the viterbi decoding algorithm
A system for generating and storing trace bits for Viterbi decoding of binary convolution codes includes at least one arithmetic logic unit (ALU) for determining the trace bits, and a first...
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7031408 |
Mechanism for reducing recovery time after path loss in coded data communication system having sequential decoder
A search path recovery mechanism for a sequential decoder employs a prescribed self-concatenated “Loeliger” convolutional code, that is either decodable by the sequential decoder for data...
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7031406 |
Information processing using a soft output Viterbi algorithm
A SOVA decoding method determines, for each information symbol time and each state of a decoding trellis, a vector of probabilities for each possible symbol value in accordance with transition path...
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7027521 |
Digital transmission method of the error correcting coding type
A digital transmission method with error correcting coding includes a coding procedure and a decoding procedure in order to correct transmission errors. The coding procedure includes a plurality of...
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7027497 |
Adaptive equalization method and adaptive equalizer
During reception of a training signal in a received signal R(n) an estimated impulse response value H m (n) of an M-channel, and a tap coefficient G(n) of a linear filter 111 is calculated by an...
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7027519 |
Iterative maximum likelihood channel estimation and signal detection for OFDM systems
In orthogonal frequency division multiplexing systems, iterative maximum likelihood channel estimation and signal detection is preformed. The channel estimation gives the maximum likelihood...
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7027530 |
Method and apparatus for maximizing receiver performance utilizing mid-packet gain changes
The present invention provides a method of and an apparatus for changing the gain of a receive path amplifier during the middle of a packet transmission, and particularly changing the gain during a...
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7027533 |
Turbo-reception method and turbo-receiver
An impluse response h mn (q) of each transmission path is estimated from N received signals r m (m=1, . . . , M) and a known signal (for a number of users equal to N, n=1, . . . , N). M×N matrix...
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7027532 |
Viterbi decoding with channel and location information
A method for exploiting location information inherent in the location of points within a transmitted signal constellation. A common method for assigning weights to branch metrics in a Viterbi...
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7027531 |
Method and system for initializing a training period in a turbo decoding device
A method for processing an information sequence with an iterative decoder is provided. The information sequence is divided into a current window and at least one additional window. The current...
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7023935 |
Trellis based maximum likelihood signal estimation method and apparatus for blind joint channel estimation and signal detection
A method and system performs blind joint channel estimation and signal detection in a communication system that includes multiple channels for transmitting symbols. The multiple channels are...
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7023898 |
Accelerated method of detection by spheres
A method of detecting a plurality of symbols (d k (i)) transmitted by or for a plurality K of users, each symbol belonging to a modulation constellation and being the subject of a spectral...
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7023934 |
Method and apparatus for min star calculations in a map decoder
Method and apparatus for Min star calculations in a Map decoder. Min star calculations are performed by a circuit that includes a first circuit that performs an Min(A,B) operation simultaneously...
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7023936 |
Method and apparatus for decoding lattice codes and multilevel coset codes
Some embodiments of the present invention include a decoding system in which the decoding system uses iterative decoding techniques to decode signals encoded with lattice codes and/or multilevel...
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7020209 |
Data transmission method, data transmission system, transmitter and receiver
A data transmission method etc. are provided. At the transmitting side, an error-detecting code of the transmitted data is calculated, frame by frame, the error-detecting code is arranged after the...
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7020223 |
Viterbi decoder and method using sequential two-way add-compare-select operations
In a Viterbi decoder, 2 n -way add-compare-select (ACS) operations are performed by sequential and/or parallel two-way ACS operations. In one embodiment, first two-way ACS operations generate an...
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7020214 |
Method and apparatus for path metric processing in telecommunications systems
An apparatus and a method for calculating in-place pat metric addressing far a trellis processing arrangement are provided. An arrangement of cascaded multiplexers and stores receives a known input...
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7016440 |
Iterative MMSE equalization-decoder soft information exchange decoding method and device
A method and device employing an iterative MMSE equalization-decoder soft information exchange decoding. The method uses a MMSE equalizer which receives and outputs soft information. The equalizer...
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7016434 |
Detection of interfering signal in radio receiver
A method and equipment for detecting an interfering signal in a time division multiple access radio receiver, in which case, samples are taken from a received signal in symbol sequences over a time...
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7017104 |
Method and system for decoding block codes by calculating a path metric according to a decision feedback sequence estimation algorithm
A method and system are disclosed that provide a more efficient decoder for decoding block codes such as a complementary code keying (CCK) code. A receiver receives a signal containing at least one...
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7012975 |
Method and apparatus for performing calculations for forward (alpha) and reverse (beta) metrics in a map decoder
Method and apparatus for performing calculations for forward (alpha) and reverse (beta) metrics in a map decoder. The method includes using a min star (min*) operation to receive the metrics and a...
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7012974 |
High rate product code decoding for partial response channel
The present invention is directed to a detector for a high-density magnetic recording channel and other partial response channels. The present invention presents a method for decoding a high rate...
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7012976 |
Method for decoding and of joint equalization of a digital signal protected by a code defined by a trellis
The invention concerns a method for jointly decoding and equalizing a digital signal protected by a trellis-defined code and transmitted though a channel. The method consists in carrying out a...
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7010030 |
Software definable block adaptive decision feedback equalizer
A block decision feedback equalizer is designed by deriving, from first principles, a block exact decision feedback equalizer and then systematically applying simplifying assumptions to obtain...
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7010051 |
Coding apparatus, coding method and recording medium having coded program recorded therein, and decoding apparatus, decoding method and recording medium having decoded program recorded therein
Error correction coding and decoding according to a serial concatenated modulation system are carried out under high code rate. A coding apparatus 1 comprises three convolutional coders 10, 30 and...
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7010052 |
Apparatus and method of CTCM encoding and decoding for a digital communication system
A method of building systematically a multi-dimensional (n, D, L) circular trellis coded modulation (CTCM) encoder with properties of optimal energy efficiency, strong tail biting and maximum...
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7010065 |
Method and apparatus for word synchronization with large coding distance and fault tolerance for PRML systems
A method and apparatus are provided for word synchronization with large coding distance and fault tolerance for a partial-response maximum-likelihood (PRML) data channel in a direct access storage...
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7006566 |
Two stage equalizer for trellis coded systems
For use in a receiver capable of decoding trellis encoded signals, there is disclosed an apparatus and method for reducing error propagation in a two stage decision feedback equalizer. The...
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7003709 |
Hybrid ARQ retransmission method with reduced buffer size requirement and receiver therefor
A hybrid ARQ retransmission method in a communication system wherein data packets consisting of identical or partly identical modulation symbols encoded with a forward error correction (FEC)...
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7002767 |
Detection of recorded data employing interpolation with gain compensation
A repeatable run-out (RRO) detector employs one or more digital interpolators to interpolate asynchronous sample values representing an RRO address mark (AM) and RRO data, and an asynchronous...
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7003055 |
Systolic equalizer and method of using same
A method and apparatus provide a systolic equalizer for Viterbi equalization of an 8-PSK signal distorted by passage through a communication channel. The systolic equalizer architecture is scalable...
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7003716 |
Method and apparatus for using multi-dimensional trellis codes over multi-path channels
An approach for using multi-dimensional trellis codes in a communication system over a multi-path channel, such as a wireless local area network, is provided. In this approach, the received signal...
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7003041 |
Device and method for decoding turbo codes
A method and apparatus for decoding turbo codes using a sliding window method is disclosed. In decoding a received sequence using a Maximum A Posteriori (MAP) algorithm, a learning by a backward...
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6999521 |
Method and apparatus for shortening the critical path of reduced complexity sequence estimation techniques
A method and apparatus are disclosed for improving the processing time of reduced complexity sequence estimation techniques, such as reduced state sequence estimation. Precomputing the branch...
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6999532 |
Decoding circuit and method of Viterbi decoder
The invention provides a decoding circuit and a decoding method of a Viterbi decoder. The decoding circuit of the Viterbi decoder includes a branch metric unit, an add-compare-select unit and a...
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6999531 |
Soft-decision decoding of convolutionally encoded codeword
A method and apparatus for decoding convolutional codes used in error-correcting circuitry for digital data communication. To increase the speed and precision of the decoding process, the branch...
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6996765 |
Turbo decoder prolog reduction
This invention describes implementation approaches for sliding window turbo decoders. Sliding windows are used for both the beta and alpha state metric calculations. Initialization of the...
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6996196 |
Sequence estimation method and sequence estimator
In a sequence estimation method and a sequence estimator of the present invention, a metric is calculated using a received signal and its estimated value, also another metric is calculated using a...
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6996195 |
Channel estimation in a communication system
A method and apparatus for estimating channels in orthogonal frequency division multiplexed (OFDM) communication systems. The method and apparatus allows a channel estimate to be determined...
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