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7522680 |
Apparatus, system, and method for asymmetric maximum likelihood detection
An apparatus, system, and method are disclosed for asymmetric maximum likelihood detection. An initialization module initializes a plurality of branch metrics and a plurality of path memories. A...
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7522679 |
System and method for adapting to a change in constellation density while receiving a signal
One embodiment comprises a transmitter precoder operating on an input signal to produce an output signal for modulation. The output signal is transmitted using a constellation with a constellation...
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7522678 |
Method and apparatus for a data-dependent noise predictive viterbi
An improved Viterbi detector is disclosed in which each branch metric is calculated based on noise statistics that depend on the signal hypothesis corresponding to the branch. Also disclosed is a...
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7519897 |
Decoding apparatus and decoding method
To provide a decoder and decoding method capable of reducing the number of times received data is decoded. A decoder according to the present invention includes: a Viterbi decoder decoding received...
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7515644 |
Apparatus and method for space-time-frequency block coding for increasing performance
A space-time-frequency block coding apparatus and method in a transmitter with three transmit (Tx) antennas are provided. An input symbol sequence is transmitted through three Tx antennas according...
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7515660 |
Joint demodulation using a viterbi equalizer having an adaptive total number of states
Systems and methods for performing joint demodulation using a Viterbi equalizer having an adaptive total number of states are disclosed. Generally, a method includes joint demodulating a desired...
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7515659 |
Decoding techniques for multi-antenna systems
In one embodiment, a wireless device for a wireless data communication system including the wireless device and a base station. The base station includes a plurality of first groups and a...
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7512198 |
Efficient diversity combining for wideband downlink
A communication system employing site diversity combing to increase link availability includes at least two receivers at receive sites within a single downlink beam separated by enough distance to...
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7510117 |
Decoding with memory in RFID system
RFID readers, RFID tags, software, and methods decode a signal received in an RFID system. From received data, a decoder determines a number of possible test series for the output. In one...
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7512870 |
Method and system for improving the performance of a trellis-based decoder
Method and system are provided for improving the performance of a trellis-based decoder. States with reduced uncertainty (SRUs) are defined for one or more predetermined fields in an encoded...
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7508880 |
Apparatus and method for space-time-frequency block coding for increasing performance
A space-time-frequency block coding apparatus and method in a transmitter with three transmit (Tx) antennas are provided. An input symbol sequence is transmitted through three Tx antennas according...
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7509108 |
Method and apparatus for automatic frequency correction with a frequency error signal generated by block correlation of baseband samples with a known code sequence
The present invention is related to a method and apparatus for automatic frequency correction of a local oscillator. The apparatus receives a carrier signal. The carrier signal includes a code...
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7502418 |
Method and apparatus for joint equalization and decoding of multilevel codes
A method and apparatus are disclosed for joint equalization and decoding of multilevel codes, such as the MLT-3 code, which are transmitted over dispersive channels. The MLT-3 code is treated as a...
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7499507 |
Synchronization module using a Viterbi slicer for a turbo decoder
A method for synchronizing receivers that receive turbo encoded signals to a received signal. Turbo encoding may enable signals to be decoded at a much lower signal to noise ratio than previously...
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7499509 |
Receiver for compensating nonlinearly distorted multicarrier signals
An apparatus for compensating nonlinearly distorted multicarrier signals, a multicarrier signal receiver using the same, and a method therefor are provided, where the apparatus for compensating...
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7499498 |
Hybrid memory architecture for reduced state sequence estimation (RSSE) techniques
A method and apparatus are disclosed for improving the processing time of reduced complexity sequence estimation techniques, such as reduced state sequence estimation (RSSE). The possible values...
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7496159 |
Survivor memory management in a Viterbi decoder
An apparatus for survivor path decoding in a Viterbi decoder with a constraint length of K. The apparatus of the invention includes a best survivor unit, a a register-exchange network, and a...
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7492839 |
Efficient implementation of GSM/GPRS equalizer
The disclosed invention provides a method, a system and a computer program product for the maximum likelihood sequence estimation of transmitted MSK symbols. The disclosed invention provides a set...
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7489744 |
Turbo decoding method and apparatus for wireless communications
In a communication system 10, a method and apparatus provide for decoding a sequence of turbo encoded data symbols. The channel nodes R x , R y and R z are updated based on a received channel...
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7489621 |
Adaptive puncturing technique for multicarrier systems
Various embodiments are described for adaptive puncturing techniques involving an adaptive bit loading block to select a modulation scheme and a puncturing pattern for each of a plurality of...
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7489746 |
MIMO receiver using maximum likelihood detector in combination with QR decomposition
A MIMO receiver is provided with a preprocessor for performing QR decomposition of a channel matrix H wherein the factored reduced matrix R is used in place of H and Q*y is used in place of the...
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7487432 |
Method and apparatus for multiple step Viterbi detection with local feedback
A reduced-state Viterbi detector is disclosed that precomputes branch metrics for a multiple-step trellis for speculative sequences of one or more channel symbols; selects one of said precomputed...
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7487430 |
Apparatus and method for receiving packet data control channel in a mobile communication system
An apparatus and method for receiving control information transmitted from a transmitter using one of a plurality of slot lengths in a high-speed packet transmission mobile communication system is...
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7486745 |
Method for improving multipath mitigator low path separation error behavior
A process is disclosed for discriminating between received ranging signals, such as GPS, GNSS, and radar signals, which arrive via a single path and those which arrive via multiple paths. The...
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7483497 |
Method and apparatus for calculating log-likelihood ratio for decoding in a receiver for a mobile communication system
A method and apparatus are provided for calculating a log-likelihood ratio (LLR) for decoding in a receiver for a mobile communication system, wherein the method and apparatus determine selection...
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7484158 |
Method for decoding a low-density parity check (LDPC) codeword
A method for decoding a noisy codeword (y) received from a communication channel as the result of a LDPC codeword (b) having a number (N) of codeword bits is disclosed. Each codeword bit consists...
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7480340 |
Signal estimation methods and apparatus
A method and an apparatus for estimating likelihood values for signals of a sequence of signals transmitted from a transmitter through a channel to a receiver. The method employs a plurality of...
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7480852 |
Method and system for improving decoding efficiency in wireless receivers
Techniques are provided herein to improve the decoding efficiency in a wireless receiver to obtain a correctly decoded data string. A state metric matrix from a received codeword is used to...
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7480376 |
Apparatus and method for providing call status information
An apparatus and method use logical network connections to telephones interconnected by the network to obtain the status of station-specific telephony function information and then to convert the...
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7477709 |
Device and method for data reproduction
A device and method of data reproduction that can achieve a reference level optimizing the characteristic of a channel and can be applied to the reproduction of data on an optical disk are...
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7477696 |
Space-time coding digital transmission systems and methods
The invention concerns digital signal transmission. In particular, it concerns high speed transmission using layered space-time encoding architecture adapted to all types of propagation channels. ...
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7478315 |
Parallel spectral equalization channels with low density parity check codes
The present invention combines low density parity checking with parallel equalization channels to enhance data retrieval from tape. Viterbi analysis is done as a precursor to the use of at least...
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7474860 |
Optimum sample spacing in over-sampled maximum likelihood sequence estimation receivers
In an over-sampled maximum-likelihood sequence estimation (MLSE) receiver system, the optimal sample spacing is determined for a variety of conditions. In an illustrative implementation, the system...
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7471742 |
Method and construction for space-time codes for AM-PSK constellations
Space-time codes are developed for multi-radii AM-PSK constellations. Further, a “super-unified” space-time code construction is developed that incorporates multi-radii AM-PSK codes with the...
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7471746 |
Whitening of data-dependent, non-stationary noise in an inter-symbol interference channel detector
A decoder includes cascaded lattice filters that receive encoded data and include adaptive inputs and output taps. A tap control couples a selected output tap to a viterbi input as a function of a...
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7469014 |
Reduced bitstream candidate based receiver and received signal processing method
A receiver comprises multiple receiving antennas configured to receive bitstreams transmitted from multiple transmission antennas; a bitstream candidate estimator configured to estimate a...
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7466768 |
IQ imbalance compensation
The present invention discloses a method and apparatus of IQ imbalance compensation for a receiver. The repetitive attribute of the preamble in a signal received by the receiver is used to estimate...
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7466773 |
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...
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7463702 |
System and method for one-pass blind transport format detection
For use in a CDMA receiver having a Viterbi decoder, a system for, and method of, performing one-pass blind transport format detection (BTFD) with respect to a received frame and a WCDMA receiver...
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7463899 |
Methods and apparatus for detecting local maximums in a two-dimensional data set
Methods and apparatus for detecting local maximums in a two-dimensional data set. Apparatus is provided for detecting a local maximum in a two-dimensional data set, where a stream of data elements...
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7463703 |
Joint symbol, amplitude, and rate estimator
The system in one embodiment relates to tightly integrating parameter estimation, symbol hypothesis testing, decoding, and rate identification. The present invention provides Turbo-decoding for...
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7460593 |
Signal processing device capable of enhancing correctness of feedback signals
A signal processing device for processing a passband signal to generate an equalized signal includes a passband adaptive equalizer for generating the equalized signal according to the passband...
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7460608 |
Parallel concatenated code with soft-in soft-out interactive turbo decoder
A method for parallel concatenated (Turbo) encoding and decoding. Turbo encoders receive a sequence of input data tuples and encode them. The input sequence may correspond to a sequence of an...
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7457355 |
Method for an equalizer computation in a media system using a data set separator sequence
An equalizer coefficients generator receives a DSS sequence and a DSS readback sequence, which is a function of a channel processing of the DSS sequence by a read channel. The generator generates a...
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7457367 |
Detector and method for estimating data probability in a multi-channel receiver
A detector and method for estimating channel data probability in a multi-user or multiple-input multiple-output communication system includes summing conditional bit probabilities conditioned on...
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7457377 |
Device for estimating a sequence of N bits corresponding to a received sequence of M digital data and associated methods
A system and method is provided for estimating a sequence of N bits ({circumflex over (x)} 0 {circumflex over (x)} 1 . . . {circumflex over (x)} N−1 ) corresponding to a received sequence of M...
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7457276 |
Transmission and reception system, transmission and reception device, and method of transmission and reception
A transmission and reception system utilizes primarily a combination of punctured-convolution-coding and diversity. Degradation in likelihood of certain data is prevented by adopting the steps of...
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7453960 |
LDPC encoder and encoder and method thereof
A decoder for decoding low-density parity-check codes comprises a first calculator to calculate LLrR ml , for each parity check equation, at iteration i−1. A detector detects LLrR ml , at...
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7453922 |
Wireless communication systems and methods for contiguously addressable memory enabled multiple processor based multiple user detection
The invention provides methods and apparatus for multiple user detection (MUD) processing that have application, for example, in improving the capacity CDMA and other wireless base stations. One...
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7450668 |
Soft bit viterbi equalizer using partially collapsed metrics
First and second partially collapsed metric values are determined for each bit in a symbol transition. Each first partially collapsed metric value is a cumulative metric of starting in a first...
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