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7623797 |
Compensating impairments of optical channel using adaptive equalization
An embodiment of the invention is a technique to equalize received samples. An optical to electrical converter (OEC) produces an electrical signal vector representing at least one of amplitude,...
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7623600 |
High speed receive equalizer architecture
Equalization is provided in a high speed communication receiver that includes in various aspects an automatic gain control input stage, a decision feedback equalizer, a clock and data recovery...
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7623570 |
Multi sub-carrier communication system and method providing improved frequency equalization performance
There is provided a multi sub-carrier communication system for providing improved performance of a frequency equalizer and a method thereof. The multi sub-carrier communication system includes a...
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7620101 |
Equalizer circuit, communication system, and method that is adaptive to varying launch amplitudes for reducing receiver error
A transmission line equalizer, communication system, and method are provided for adaptively compensating for changes in transmission path length and transmission path medium. Within the equalizer...
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7620100 |
Method and apparatus for equalization of a signal which is transmitted via a user channel using the DF method, and taking into account an interference channel
In a method for equalization of a signal that is transmitted via a user channel using the DF method, an interference channel is taken into account by the DF contribution that is used for processing...
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7620096 |
Equal BER power control for uplink MC-CDMA with MMSE successive interference cancellation
For a given decision order, MMSE successive interference cancellation (MMSE-SIC) can simultaneously maximize SIRs of all users. To further increase its efficiency, a power control (PC) algorithm,...
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7616700 |
Method and system for slicing a communication signal
A slicer can receive a communication signal having a level or amplitude that is between two discrete levels of a multilevel digital communication scheme. The slicer can compare the communication...
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7616699 |
Method of soft bit metric calculation with direct matrix inversion MIMO detection
A telecommunication MIMO receiver implements soft bit metric calculation with direct matrix inversion MIMO detection. The receiver has a detector that detects data symbols in a received signal by...
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7616686 |
Method and apparatus for generating one or more clock signals for a decision-feedback equalizer using DFE detected data
Methods and apparatus are provided for generating one or more clock signals for a decision-feedback equalizer using DFE detected data. A received signal is sampled using a data clock and a...
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7613238 |
Apparatus and method for decision error compensation in an adaptive equalizer
An adaptive equalizer comprises: a forward equalizer (FE) receiving a symbol stream to generate an FE output; a decision feedback equalizer (DFE) receiving a decision symbol stream to generate a...
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7606302 |
Method and apparatus for non-linear decision-feedback equalization in the presence of asymmetric channel
Methods and apparatus are provided for determining the threshold position of one or more latches employed for decision-feedback equalization in the presence of a non-linear channel. A latch...
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7606301 |
Method and apparatus for adaptively establishing a sampling phase for decision-feedback equalization
Methods and apparatus are provided for adaptively establishing the optimal sampling phase offset for a DFE operation. According to one aspect of the invention, one or more values in an amplitude...
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7606293 |
Bidirectional turbo ISI canceller-based DSSS receiver for high-speed wireless LAN
A bidirectional turbo ISI canceller cancels precursor-ISI as well as postcursor-ISI in a received signal without incorporating a multiplicative feedforward equalization filter. This is accomplished...
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7599461 |
Method and apparatus for generating one or more clock signals for a decision-feedback equalizer using DFE detected data in the presence of an adverse pattern
Methods and apparatus are provided for generating one or more clock signals for a decision-feedback equalizer using DFE detected data, in the presence of an adverse pattern, such as a Nyquist...
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7599433 |
Apparatus for and method of controlling a feedforward filter of an equalizer
A method of controlling a feedforward filter of an equalizer includes the steps of generating a complex representation of an output of the feedforward filter and generating a representation of a...
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7599431 |
Combined decision feedback equalization and linear equalization
A communication system includes a transmitter, a communication channel, and a receiver. The transmitter includes a pre-emphasis module, a summing module, a line driver, and a decision feedback...
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7596175 |
Methods and circuits for performing margining tests in the presence of a decision feedback equalizer
Described are methods and circuits for margin testing receivers equipped with Decision Feedback Equalization (DFE) or other forms of feedback that employ historical data to reduce intersymbol...
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7593483 |
Nonlinear mapping in digital-to-analog and analog-to-digital converters
In a high-fidelity digital modulator, a mapper is provided to minimize quantization noise, jitter, and cross-talk between multiple digital-to-analog or analog-to-digital converters. The mapper...
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7593456 |
Maximum likelihood block decision feedback estimation for CCK demodulation apparatus and method
A maximum likelihood CCK detector has a first subtractor which subtracts the contents of a pre-equalize register from a current symbol, and the output of this subtractor is coupled to a simple Fast...
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7590175 |
DFE margin test methods and circuits that decouple sample and feedback timing
Described are methods and circuits for margin testing digital receivers. These methods and circuits prevent margins from collapsing in response to erroneously received data, and can thus be used in...
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7590174 |
Signal adjustment receiver circuitry
Systems and methods for adjusting a signal received from a communication path are disclosed. A receiver can receive a signal from a communication path which attenuates at least some frequency...
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7586984 |
Finite-length equalization over multi-input multi-output (MIMO) channels
A Multiple-Input Multiple Output (MIMO) Decision Feedback Equalizer improves operation of a receiver by canceling the spatio-temporal interference effects caused by the MIMO channel memory with a...
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7586983 |
Systems and methods for offset cancellation in integrated transceivers
In high speed receiver circuitry (e.g., on a programmable logic device (PLD) or the like), decision feedback equalization (DFE) circuitry is used to at least partly cancel unwanted offset (e.g.,...
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7586982 |
Kalman filter based method and apparatus for linear equalization of CDMA downlink channels
Disclosed is a minimum mean square error (MMSE) equalizer and method for single-user detection of a signal received from a downlink code-division multiple access CDMA channel. The equalizer...
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7583770 |
Multiplex signal error correction method and device
A method of reducing a phase error caused by a plurality of error sources in a signal in the form of a sequence of a plurality of digital partial signals associated with a number of subcarriers (k)...
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7583728 |
Equalizers for layered modulated and other signals
A method and apparatus for equalizing digital data signals is disclosed. The method comprises the steps of demodulating and decoding an input signal having input data to produce a data output,...
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7580455 |
Decision feedback equalization with fractionally-spaced feedback data
A decision feedback equalizer (DFE) architecture uses feedback samples that are over-sampled with respect to the symbol rate. On-baud feedback samples are quantized with a slicer, while off-baud...
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7580454 |
Multidimensional decision-directed trained adaptive equalization
An embodiment of the invention is a technique to equalize received samples. An equalizer to equalize a multidimensional signal transmitted over a communication channel and having a dimensionality...
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7580453 |
Method and apparatus for equalization
An exemplary embodiment of an adaptive equalizer is provided, receiving symbols to generate an equalizer output. The adaptive equalizer comprises a plurality of tap cells, a coefficient updater, a...
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7580452 |
Dynamic comparator system
A dynamic comparator system includes a dynamic comparator, a feedback filter, and a summer. The dynamic comparator is configured with a comparison signal having an initial state. The dynamic...
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7577206 |
OFDM signal receiving apparatus and method for estimating common phase error of OFDM signals using data subcarriers
An Orthogonal Frequency Division Multiplexing (OFDM) signal receiving apparatus and method of estimating a common phase error (CPE) using data subcarriers (and pilot subcarriers) instead of only...
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7577193 |
Adaptive equalizer
Some embodiments of the invention include apparatus, systems, and methods to adjust a clock generator and an equalizer to reduce jitter in an output signal. A phase detector provides feedback...
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7574146 |
Pattern-dependent error counts for use in correcting operational parameters in an optical receiver
An optical transmission network includes an optical transmitter photonic integrated circuit (TxPIC) chip, utilized in an optical transmitter and has a plurality of monolithic modulated sources...
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7570701 |
Multi-pair gigabit ethernet transceiver
Various systems and methods providing high speed decoding, enhanced power reduction and clock domain partitioning for a multi-pair gigabit Ethernet transceiver are disclosed. ISI compensation is...
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7567616 |
Feedback equalizer for a communications receiver
A feedback equalizer is provided that minimizes the critical path time in a multi-level modulation receiver. The critical path is reduced by parallel operation of some summation components of the...
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7567615 |
Adaptive equalization circuit and adaptive equalization method
The present invention provides an adaptive equalization circuit and adaptive equalization method that can perform signal processing on a small scale with good computation accuracy, and can improve...
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7564933 |
Method and system for near optimal iterative detection of the 2-dimensional ISI channel
A method and system for decoding data received from a channel experiencing two-dimensional inter-symbol interference, as well as systems implementing such a decoding method and system, are...
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7564899 |
Multistage tuning-tolerant equalizer filter
A multistage equalizer filter for compensating a received distorted signal having an amplitude for frequency dependent signal modifications introduced by a transmission channel includes at least...
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7561633 |
System and method for MIMO equalization for DSP transceivers
A method to efficiently deal with FEXT crosstalk in wireline communication system via MIMO equalization is presented. A MIMO-DFE based receiver architecture is developed to demonstrate the...
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7561619 |
Feedback filter
Disclosed are a system, method and device for generating an equalized signal from an input signal. Symbols in the equalized signal may be detected on each of a sequence of symbol intervals to...
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7561617 |
Channel monitoring and identification and performance monitoring in a flexible high speed signal processor engine
Systems and methods are disclosed to provide channel monitoring and/or performance monitoring for a communication channel. For example, in accordance with an embodiment of the present invention, an...
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7551701 |
Frequency domain training of prefilters with interference suppression
Prefilters for a receiver with multiple input branches are trained in the frequency domain. The frequency response B of a conditioned channel is determined without reference to the prefilters, and...
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7551679 |
Symmetrical data signal processing
In a digital communications receiver configured to receive, via a communications channel, a received first signal representing a sequence of symbols, each symbol being encoded to be representative...
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7551667 |
Feed forward equalizer
Method and apparatus for a feed forward equalizer for a communication system are described wherein an equalizer may comprise a tapped filter having multiple filter multipliers, a correlator having...
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7548598 |
Method and apparatus for iteratively improving the performance of coded and interleaved communication systems
A system and method for improving performance of a digital communication system using forward error correction and interleaving. In the system, the channel equalization values are iteratively...
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7548582 |
Kalman-viterbi joint channel equalizer
In a channel equalizer applicable to a digital television receiver, a forward filter and a backward filter perform filtering to an input signal and a predetermined signal. A Viterbi decoder...
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7545862 |
Adaptive equalizer, decoding device, and error detecting device
For a waveform containing a partial response and distortion in only the leading-edge portion of inter-symbol interference (ISI) of a waveform equalized by a prior-stage feedforward filter (FFF) so...
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7545861 |
Timing recovery circuit and timing recovery method
A timing recovery circuit for a receiver may include a timing error detector that generates a timing error based on differences between coefficients of a feed-forward filter and a feed-back filter....
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7545859 |
Adaptive channel equalization technique and method for wideband passive digital receivers
An adaptive channel equalization technique and method for wideband passive receivers is disclosed that reduces and tends to minimize distortions caused by circuitry within passive digital...
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7542528 |
Far end crosstalk mitigation in multiple-input multiple-output (MIMO) channels using partial maximum likelihood MIMO-DFE
A partial maximum likelihood (ML) far end crosstalk (FEXT) decoder for a multiple-input multiple-output (MIMO) communications channel comprises an initial estimate generator module that generates...
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