|
Match
|
Document |
Document Title |
|
|
7636389 |
Systems and methods that provide frequency domain supplemental training of the time domain equalizer for DMT
Using a known or later developed time domain equalizer coefficient training algorithm, a least square solution for the time domain equalizer coefficients is taken at a starting point and...
|
|
|
7636051 |
Status monitor apparatus
A statistical value update unit calculates the fluctuation of measurement data. A filtering processing unit extracts a normal white noise component from the fluctuation of the measurement data...
|
|
|
7636401 |
Methods and systems for soft-bit demapping
Methods and systems for reconfigurable soft-output bit demapping, reconfigurable for different modes of operation (i.e., different transmitter/receiver configurations) and for different modulation...
|
|
|
7636398 |
Adaptive channel equalizer and method for equalizing channels therewith
A channel equalizer obtains channel impulse responses (CIRs) for all subcarriers by way of filtering channel impulse responses of specific subcarriers using at least two filters. One of the two...
|
|
|
7633354 |
Multistage tuning-tolerant equalizer filter with improved detection mechanisms for lower and higher frequency gain loops
The present invention provides an equalizer filter for compensating a received distorted signal for frequency dependent signal modifications introduced by a transmission channel, the received...
|
|
|
7634036 |
System and method for deriving symbol timing
A symbol timing derivation system derives receiver timing from received symbols which avoids the need for a pilot tone, thereby reducing power consumption and expanding usable bandwidth. The system...
|
|
|
7630466 |
Search engine for a receive equalizer
A search engine selects initial coefficients for a receive equalizer. The search engine may be incorporated into a communication receiver that includes a decision feedback equalizer and clock and...
|
|
|
7627030 |
Radio receiver with selectively disabled equalizer
A controllable equalizer is arranged to be automatically and selectively disabled and is configured to operate in a frequency modulated (FM) radio receiver. The controllable equalizer includes an...
|
|
|
7627029 |
Margin test methods and circuits
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...
|
|
|
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...
|
|
|
7623571 |
Wideband multiple access telecommunication method and apparatus
A method and system for retrieving a desired user data symbol sequence from a received signal are disclosed. In one embodiment, the method includes i) receiving a channel modified version of a...
|
|
|
7623572 |
Noise variance estimation for frequency domain equalizer coefficient determination
A Radio Frequency (RF) receiver includes a RF front end and a baseband processing module coupled to the RF front end that is operable to determine equalizer coefficients for a composite signal that...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
7609772 |
Apparatus and method for optimally compensating for imbalance between in-phase and quadrature-phase in a zero-IF OFDM receiver
An optimum I/Q imbalance compensating apparatus and method in a zero-IF OFDM receiver. In the apparatus, a first compensator generates a first symbol by removing interference from a second...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
7606330 |
Dual-rate single band communication system
A system, method, and apparatus for a multiple data rate communication system is presented herein. The communication system receives data samples that are either sampled at a narrowband rate or a...
|
|
|
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...
|
|
|
7602857 |
Digital transmitter
An equalizer provided in a digital transmitter compensates for attenuation in a signal channel to a digital receiver. The equalizer generates signal levels as a logical function of bit history to...
|
|
|
7602858 |
Digital transmitter
An equalizer provided in a digital transmitter compensates for attenuation in a signal channel to a digital receiver. The equalizer generates signal levels as a logical function of bit history to...
|
|
|
7602844 |
On-line step-size calculation using signal power estimation and tone grouping of the frequency-domain equalizer for DMT-based transceiver
An efficient method for calculating the step-sizes for a frequency-domain equalizer of a discrete-multitone communications system using signal power estimation and tone grouping (SPE-TG) while...
|
|
|
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...
|
|
|
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...
|
|
|
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...
|
|
|
7599419 |
Method and apparatus for use of space time trellis codes based on channel phase feedback
A method for multiple-input-multiple-output (MIMO) wireless communication comprises the steps of generating inner and outer codes based on channel state information available at a transmitter and...
|
|
|
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...
|
|
|
7596174 |
Equalizing a transmitter
In one embodiment, the present invention includes a method for associating a first plurality of current sources with a first tap coefficient and associating a second plurality of current sources...
|
|
|
7593461 |
Multi-user detection using equalization and successive interference cancellation
A plurality of signals are received in a shared spectrum. Samples of the received user signals are produced as a received vector. The received vector is segmented into a plurality of segments. For...
|
|
|
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...
|
|
|
7593460 |
Macro diversity equalization system and method
An equalization system and method which supports macro diversity as well as large delay spread channels with a minimal increase in complexity is disclosed. The equalization system includes a path...
|
|
|
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...
|
|
|
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...
|
|
|
7590172 |
Low bias estimation of small signal-to-noise ratio
A user equipment includes an estimator. The estimator is configured to select a first estimate of a signal-to-noise (SNR) ratio, calculate a first amplitude and first noise variance, calculate a...
|
|
|
7590173 |
System and method for performing adaptive phase equalization
An equalization circuit includes a detector to detect at least one bit pattern on a signal line and a transmit offset circuit to determine a phase-shift setting corresponding to the bit pattern...
|
|
|
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,...
|
|
|
7583742 |
Multi-band DMT receiver
There is disclosed a receiver for receiving a multi-band DMT signal. The receiver includes a plurality of demodulators, each demodulator having a discrete Fourier transform and being provided to...
|
|
|
7583753 |
Methods and transmitters for loop-back adaptive pre-emphasis data transmission
A method of transmitting data can include pre-emphasizing data for transmission by a transmitter over a transmission line based on an error feedback signal provided to the transmitter from a...
|
|
|
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...
|
|
|
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...
|
|
|
7580474 |
Digital transmitter
An equalizer provided in a digital transmitter compensates for attenuation in a signal channel to a digital receiver. The equalizer generates signal levels as a logical function of bit history to...
|
|
|
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...
|
|
|
7577192 |
Method and apparatus for characterizing the distortion produced by electronic equipment
Methods and apparatus for evaluating the performance of electronic components and systems by minimizing or eliminating intersymbol interference (ISI). The apparatus includes a transmitter, a device...
|
|
|
7577203 |
Minimizing non-deterministic noise by using wavelet transform
A wavelet transform noise minimization circuit comprises a differential receiver, a voltage comparator, a wavelet transform circuit, an electrical idle (EI) detector circuit, a phase interpolator,...
|
|
|
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...
|
|
|
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,...
|
|
|
7573945 |
System and method for joint maximal ratio combining using time-domain based signal processing
A spatial signal processing system and method are provided to optimize the received signal-to-noise ratio (SNR) at a first radio communication device based on the transmit filter at another radio...
|
|
|
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...
|