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7623578 |
Time domain equalization using frequency domain operations
An equalizer for a multi carrier transmission system, converts a transmitted multi carrier signal into sampled frequency domain signals, and suppresses time domain delay dispersion, on the sampled...
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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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7616685 |
Method for channel tracking in an LMS adaptive equalizer for 8VSB
A method and system for channel tracking in an adaptive equalizer for a digital data receiver. The method includes determining a first set of tap weights and a second set of tap weights of the...
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7616684 |
Receiver with decision-directed equalizer
A circuit is configured to receive and process a signal that includes in-phase and out-of-phase components that correspond to in-phase and out-of-phase components of a time sequence of symbols. A...
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7613252 |
Installation of digital data receivers
The invention relates to the installation of a broadcast data receiver or similarly installable apparatus. The apparatus and method of the invention includes a means for taking measurements to...
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7609759 |
Method and system of nonlinear signal processing
A nonlinear equalizer for treating the nonlinear component of a distorted digital signal includes a first processing unit adapted to receive the distorted digital signal and yield an appropriate...
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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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7606300 |
Apparatus and method for setting tap coefficient of adaptive equalizer
There is provided an apparatus and method for initializing a tap coefficient of an adaptive equalizer constituting a read path for a storage medium, where the apparatus includes an FIR filter, a...
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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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7602867 |
System and method for linear distortion estimation by way of equalizer coefficients
Provided is a method and system for estimating distortion in a communications channel including an adaptive equalizer. The method includes determining one or more adaptive filter coefficients...
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7602845 |
Adaptive filter
The present invention relates to a filter apparatus and method having a fixed aspect for providing a predetermined selectivity and having an adaptive aspect for determining the frequency response...
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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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7599453 |
Doppler spread estimation for OFDM systems
A Doppler spread value of a channel in an Orthogonal Frequency Division Multiplexing (OFDM) system is estimated, wherein the channel comprises a plurality of carrier frequencies. Estimating...
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7599449 |
Hybrid modulus blind equalization for quadrature amplitude modulation (QAM) receivers
Methods and apparatuses for blind equalizers with a hybrid adaptation error. In one embodiment, a Quadrature Amplitude Modulation (QAM) signal receiver, includes: a filter to reduce error in...
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7599432 |
Method and apparatus for dynamically inserting gain in an adaptive filter system
A method and apparatus for dynamically inserting gain in an adaptive filter is taught. This selective insertion of gain may be used to allow an adaptive filter to converge more quickly and/or to...
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7599426 |
Use of adaptive filters in multiple access wireless systems employing predictable signals
A code division multiple access (CDMA) radio system uses an adaptive filter in a receiver to mitigate multipath radio propagation and to filter out interfering signals. Characteristics of an...
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7599423 |
Successive interference canceling for CDMA
Successive interference canceling for CDMA. ICI may result from a signal's multi-path effects, or by filtering/suppression of some of the component energy of the signaling waveforms. Energy...
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7596176 |
Apparatus, system, and method for adaptive asynchronous equalization using leakage
An apparatus, system, and method are disclosed for adaptive asynchronous equalization using leakage. An equalizer sums products of a plurality of tap signals from a delay line sampling a read...
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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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7593474 |
Digital broadcast transmitting/receiving system having an improved receiving performance and signal processing method thereof
A digital broadcast transmitting/receiving system and a signal processing method thereof that can improve the receiving performance of the system. A digital broadcast transmitter has a randomizer...
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7590190 |
System and method for forward path gain control in a digital predistortion linearized transmitter
A system and method for controlling the gain in the forward signal path of a digital predistortion linearizer is disclosed. The loop gain of the predistortion system is driven to unity, where a...
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7590176 |
Partial response transmission system and equalizing circuit thereof
A partial response transmission system in which a data signal is transmitted from a transmission side to a reception side through a transmission medium, includes an equalizing circuit provided in...
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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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7583729 |
Adaptive equalizer and related method thereof
An adaptive equalizer and the related method are disclosed. The adaptive equalizer is capable of adjusting its own equalization coefficients, and includes a reference signal generator for...
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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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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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7577194 |
Equalizer and equalization method
An equalizer calculates an equalization weight using a transmission channel response vector that arranges transmission channel estimation at the detection path timing and at the neighbor path...
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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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7574175 |
Method and system for selective equalization enablement based on modulation type
Aspects of a method and system for selective equalization enablement based on modulation type may be found in a method for processing a radio frequency (RF) signal that comprises receiving a...
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7574006 |
Active noise controller
An active noise controller can determine the signal transmission characteristics from the power amplifier and the speaker to the microphone without using any special external measuring instrument...
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7573963 |
Method and apparatus for reducing the processing rate of a chip-level equalization receiver
A method and apparatus for reducing the processing rate when performing chip-level equalization (CLE) in a code division multiple access (CDMA) receiver which includes an equalizer filter. Signals...
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7573935 |
System and method for performing ranging in a cable modem system
The present invention provides a system and method for performing ranging operations in a cable modem system. In accordance with embodiments of the present invention, transmission times,...
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7570690 |
Adaptive equalizer with a dual-mode active taps mask generator and a pilot reference signal amplitude control unit
An adaptive equalizer including an equalizer filter and a tap coefficients generator used to process a sample data stream derived from a plurality of received signals is disclosed. The tap...
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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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7561647 |
Equalising and decoding device for frequency-selective channels
The invention relates to a channel equalizing and decoding device consisting of a series of modules, each of which comprises an equalizer ( 10 ) and a decoder with weighted output ( 20 ). The...
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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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7561618 |
Reconfigurable chip level equalizer architecture for multiple antenna systems
A system comprising a plurality of adaptive equalizers adapted to couple to a plurality of receive antennas, each of the antennas capable of receiving a multipath delay profile estimate (MDPE),...
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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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7558313 |
Cross-correlated TDMA, spread spectrum, CDMA and OFDM systems
Cross-Correlated Time Division Multiple Access (TDMA), Spread Spectrum, Code Division Multiple Access (CDMA) and Orthogonal Frequency Division Multiplexed (OFDM) modulated OFDM receiver and...
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7555057 |
Predistortion calibration in a transceiver assembly
Systems and methods are provided for calibrating a digital predistorter in an integrated transceiver circuit. A digital transmitter path provides a signal from a digital input. The transmitter path...
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7555040 |
Method and apparatus for generating equalizer filter tap coefficients
A method and apparatus generating an error signal and an update vector signal used to generate filter tap coefficients for an equalizer filter residing in an equalizer. The equalizer filter outputs...
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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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