Trident Microsystems (far East) Ltd.

Micronas Semiconductors, Inc.

Xiaojun Yang

Richard W Citta

Scott Matthew Lopresto

Shidong Chen

Jilian Zhu

Jingsong Xia

Gopalan Krishnamurthy

David A Willming

A method of controlling sampling frequency of a sampling device (), where the sampling device () generates samples () in response to the receipt of a signal () resulting from a transmission of a series of symbols through a channel, the method including the steps of estimating () a channel impulse response of the channel from the samples, calculating a characteristic of the channel impulse response estimate, and determining () the sampling frequency in accordance with the characteristic.

Apparatus for and method of controlling a sampling frequency of a sampling device

A digital receiver for processing a signal received from a channel includes a digital demodulator and an equalizer coupled to the digital demodulator. The equalizer includes a feedforward filter and a decision feedback equalizer (DFE), wherein the feedforward filter includes a plurality of feedforward filter taps. Coefficients are associated with the plurality of feedforward filter taps and the values of all of the coefficients associated with the plurality of feedforward filter taps are dynamically determined.

Advanced digital receiver

A method of synchronizing a feedforward filter () that receives a signal resulting from the transmission of a series of symbols through a channel, wherein the series of symbols includes a predetermined sequence of symbols includes the step of developing a plurality of samples from the received symbols (), wherein a sequence of samples corresponds to the predetermined sequence of symbols. The method further includes the steps of estimating a channel impulse response from the plurality of samples, calculating a characteristic of the channel impulse response, and synchronizing () the feedforward filter in accordance with the estimated channel impulse response.

Apparatus for and method of controlling a feedforward filter of an equalizer

A method of synchronizing a feedforward filter that receives a signal resulting from the transmission of a series of symbols through a channel, wherein the series of symbols includes a predetermined sequence of symbols includes the step of developing a plurality of samples from the received symbols, wherein a sequence of samples corresponds to the predetermined sequence of symbols. The method may further include the steps of estimating a channel impulse response from the plurality of samples, wherein the channel impulse response estimate is represented by a plurality of correlation values, identifying a maximum correlation value from the plurality of correlation values, defining a window relative to the maximum correlation value, calculating a characteristic of the correlation values within the window, and synchronizing the feedforward filter in accordance with the characteristic.

A method of controlling the operation of an equalizer (), wherein the equalizer is adapted to receive a transmitted signal () comprising at least one predetermined sequence of symbols, includes the step of developing a set of samples from a received signal. At least one plurality of samples is identified, wherein the at least one plurality of samples corresponds to the at least one predetermined sequence of symbols. The equalizer is then operated in a selected one of three modes. A first mode is selected if the at least one plurality of samples is identified, wherein the first mode includes the step of developing a signal-to-noise ratio (SNR) (). A second mode is selected if the at least one plurality of samples is identified and the SNR is greater than a first predetermined threshold. A third mode is selected if the at least one plurality of samples is identified and the SNR is greater than a second predetermined threshold.

Apparatus for and method of controlling the operation of an equalizer

A DFE comprises a trellis decoder and a plurality of sub-filter pipelines. Each of the plurality of sub-filter pipelines is fed intermediate decoded symbols of one of the stages in a trace-back chain of a current decoding bank. The DFE output is formed by summing the plurality of sub-filter pipelines.

Transposed structure for a decision feedback equalizer combined with a trellis decoder

A digital equalizer for interpreting a digital signal including convolutionally encoded symbols and synchronization symbols outside the convolutional code comprises a combined trellis encoder and DFE. The synchronization symbols are re-inserted into the input of the DFE in order to restore time domain continuity created by removal of the synchronization symbols.

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Port Barrington, IL, United States of America

Xiaojun Yang