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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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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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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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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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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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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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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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7567614 |
Altering power consumption in communication links based on measured noise
A method, circuit and system for altering the power consumption in communication links. A type of noise and an amount of jitter in a signal transmitted across a communication link is measured. Upon...
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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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7539794 |
PRBS generator selection in modem communication
The present invention relates to a system and method for selecting one of plurality of PRBS generators for use with a modem. The modem includes a measuring device adapted to measure an operating...
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7530004 |
Error correction apparatus using forward and reverse threshold functions
An error detection and correction apparatus includes three threshold logic units which make decisions based on current and previous bit values in a bit stream of block-coded data. One of the...
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7526021 |
Telecommunications transmission systems
In a multi-carrier system employing OFDM, for example DMT, an adaptive channel equalizer is normally used, operating in the frequency domain. The sampling clock is controlled so that the time delay...
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7526019 |
Method and system for providing multi-channel multimode QAM equalization and carrier recovery
A system for providing multi-channel multi-mode QAM equalization and carrier recovery is provided. According to one exemplary embodiment, the system includes an equalization circuit and a carrier...
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7522514 |
Systems and methods for high rate OFDM communications
Messages transmitted between a receiver and a transmitter are used to maximize a communication data rate. In particular, a multicarrier modulation system uses messages that are sent from the...
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7505515 |
Accurate timing alignments for decision directed continuous time equalizers
A continuous time equalizer for equalizing an input signal using a feedforward equalizer portion and a feedback equalizer portion is provided that includes: a slicer operable to make bit decisions...
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7502411 |
Method and circuit for adaptive equalization of multiple signals in response to a control signal generated from one of the equalized signals
In preferred embodiments, an adaptive equalization circuit including at least two equalization filters (each for equalizing a signal transmitted over a multi-channel serial link) and control...
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7496340 |
I/Q mismatch calibration of direct conversion receivers using radio frequency noise
A system and method are provided for calibrating for an I/Q mismatch of a direct conversion receiver based on a random signal having a two-dimensional I versus Q trajectory, such as radio frequency...
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7492813 |
Startup protocol for high throughput communications systems
A startup protocol is provided for use in a communications system having a communications line with a master transceiver at a first end and a slave transceiver at a second end, each transceiver...
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7483505 |
Unblind equalizer architecture for digital communication systems
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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7480497 |
Multicarrier receiver and method for carrier frequency offset correction and channel estimation for receipt of simultaneous transmissions over a multi-user uplink
Multicarrier receivers and methods for carrier frequency offset correction and channel estimation for receipt of simultaneous transmissions over a multi-user uplink are generally described herein....
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7477705 |
Method for demodulating a digital signal based on an estimate of multipath propagation impairment, and an associated receiver
A method for demodulating a received digitally modulated signal subjected to multipath propagation impairment includes estimating the multipath propagation impairment of the received digitally...
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7463681 |
Architecture for feedback loops in decision feedback equalizers
A decision feedback equalizer (DFE) has an inter symbol interference (ISI) loop and inter chip interference (ICI) loop. A buffer at the input of the DFE loop receives a (CCK based data rate) signal...
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7463678 |
Equalization scheme for DSL receivers in presence of an under-sampled or over-sampled transmit IDFT
A circuit and method is provided for reducing the effect of having potentially different sizes for an Inverse Discrete Fourier Transform (IDFT) at a transmitter and a Discrete Fourier Transform...
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7457357 |
Decision feedback equalizer design with interference removal and reduced error propagation
A method for designing a decision feedback equalizer (DFE) that handles packet based input data signals uses an inter symbol interference (ISI) removal loop and an inter chip interference (ICI)...
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7457356 |
Method of initializing equalizer of digital television receiver and equalizer using the same
A method of initializing an equalizer of VSB DTV receiver and an equalizer using the same are provided. The method includes the steps of: obtaining a channel estimation value by estimating an...
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7453932 |
Test device and setting method
A testing apparatus for testing a device under test is provided, wherein the testing apparatus includes: a comparator for receiving a signal output from the device under test and converting the...
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7450635 |
Single antenna interference cancellation within a wireless terminal
The present invention provides a multi-branch equalizer processing module operable to cancel interference associated with received radio frequency (RF) burst(s). This multi-branch equalizer...
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7443914 |
DFE to FFE equalization coefficient conversion process for DOCSIS 2.0
A method and appartus for converting FFE and FBE coefficients from a DOCSIS compatible cable modem termination system upstream equalizer into FFE only coefficients to be sent down to the cable...
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7443913 |
High speed decision feedback equalizer
An equalizer comprises a sampler, a filter, and a summer. The sampler samples a signal indicative of an input communication signal to determine digital decision output signals having a...
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7440410 |
Off-line broadband network interface
A network interface is presented that receives packet data from a shared medium and accomplishes the signal processing required to convert the data packet to host computer formatted data separately...
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7433418 |
Method and apparatus for efficient storage of training sequences for peak to average power constrained modulation formats
Some embodiments store a training sequence in a communications system. The stored training sequence exhibits certain desirable characteristics when used by a peak to average power constrained...
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7421022 |
Method for robust and stable convergence of blind LMS based adaptation of coefficients for a continuous time FFE-DFE
A continuous time electronic dispersion compensation architecture using feed forward equalization and a non-linear decision feedback equalization forms an output signal by a linear combination of...
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7421021 |
Adaptive signal equalizer with adaptive error timing and precursor/postcursor configuration control
An adaptive signal equalizer with a feedforward filter in which the feedback error signal and corresponding incoming data signal are dynamically aligned in time using signal interpolation, and...
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7408982 |
Equalizer for high definition television and equalization method thereof
An equalizer and an equalization method usable in a high definition television (HDTV) are provided. The equalizer may receive an input signal including a data signal and a training sequence and may...
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7406122 |
Equalizer and method of setting initial value for same
An equalizer is provided which is capable of making a filter factor to be set in the equalizer having an equalizing filter converge rapidly and a method is provided for setting an initial value for...
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7400672 |
Method and system for detecting transmitter errors
A system for detecting transmission errors in a data transmission system includes a receiver for receiving a data packet transmitted thereto by a corresponding transmitter and transmitting the data...
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7394849 |
Decision feedback equalizer with dynamic feedback control
A decision feedback equalizer with dynamic feedback control for use in an adaptive signal equalizer. Timing within the decision feedback loop is dynamically controlled to optimize recovery of the...
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7394753 |
Training premable in multipoint-to-point communication using orthogonal frequency division multiplexing
A training premable in multipoint-to-point communication using orthogonal frequency division multiplexing (OFDM) is provided. In one embodiment, a system comprises a host unit and a plurality of...
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7388909 |
Initialization method for a network system
An initialization method for a network system is disclosed, which uses a channel estimation to predetermine coefficients of an FFE and an FBE. As such, convergence of the FFE, the FBE, a timing...
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7369603 |
Compensating for spectral attenuation
A method and apparatus to compensate for spectral attenuation are described wherein the spectral attenuation for a communications channel is determined, a first filter is created for the...
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7366475 |
Signal strength measurements in cellular telecommunication systems
A mobile station (MS) and method for estimating received signal strength of a radio signal from a neighboring cell in a cellular radio telecommunication network. The MS measures the received signal...
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7366232 |
Method and device for the automatic selection of the bit rate in high frequency transmissions
A method and device for determining at least one traffic parameter in a data transmission system including at least one transmitter and one receiver, wherein the receiver includes a modem with...
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7362803 |
Method and system for interactive channel equalization
A method and system for interactive channel equalization uses channel status information included in data packets. The system includes a first station adapted to transmit a first data packet...
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7362800 |
Auto-configured equalizer
An signal communication device having an auto-configured equalizer. The signal communication device includes a scoping circuit, buffer circuit, select circuit and equalizing circuit. A test signal...
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7349468 |
Methods and devices for shortening the convergence time of blind, adaptive equalizers
The convergence time of a blind, adaptive equalizer is shortened by using a tracking generator. The tracking generator comprises a smoothing filter which receives and smoothes a tap coefficient...
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7342974 |
Channel estimation in OFDM systems
A method for estimating channels of an OFDM signal. The method comprises the steps of deriving responses of pilot channels, deriving responses of first data channels by time and frequency domain...
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7336220 |
Method and apparatus for equalizing broadband chirped signal
In order to generate a signal for canceling a chirped signal, a transmitter generates a cancellation signal along with the transmitted signal, using a single term variable complex gain multiplier...
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