Mstar Semiconductor, Inc.

Chih-Cheng Kuo

Tai-Lai Tung

Wen-Chieh Yang

Ko-Yin Lai

Fong-Shih Wei

Chu-Hsin Chang

Ching-Fu Lan

Jen-Hsing Wang

Ching-Wen Ma

Chun-Chi Su

Chih-Ching Chen

Chih-Hsun Lin

Chia-Sheng Peng

A signal receiving apparatus includes a signal processing circuit, an adjacent-channel interference (ACI) filter and an ACI detecting circuit. The signal processing circuit performs a signal processing process on an input signal to generate a processed signal. The ACI filter filters out ACI from the processed signal to generate a filtered signal. The ACI detecting circuit detects an energy difference between the processed signal and the filtered signal, and provides the energy difference to the signal processing circuit as a reference for adjusting the signal processing process.

Signal receiving apparatus in communication system and signal processing method thereof

An equalizer apparatus includes a feedforward filter, a slicer circuit and a feedback circuit. The feedforward filter processes an input signal. The slicer circuit includes a Viberbi decoding circuit coupled to the feedforward filter, and performs a Viberbi algorithm based decision operation to generate a decision signal according to an output signal of the feedforward filter and a feedback signal of the feedback filter. The feedback filter generates the feedback signal according to the decision result signal.

Equalizer apparatus and Viterbi algorithm based decision method

A method for estimating a channel state of an audio/video signal includes: estimating a first response and a second response according to the audio/video signal, wherein the first response corresponds to an echo path and the second response corresponds to a reference path; calculating a plurality of phase differences at a plurality of time points between the first response and the second response; determining whether the echo path is a Doppler path according to the phase differences; and when it is determined that the echo path is the Doppler path, calculating a phase rotation frequency of the Doppler path according to a difference between at least two of the phase differences.

Method and circuit for estimating channel state and associated receiver

An equalizing apparatus includes a feedforward filter, a soft slicer and a feedback filter. The feedforward filter processes an input signal. The soft slicer performs a soft decision according to an input signal of the feedforward filter and a feedback signal of the feedback filter to generate a decision result signal. The feedback filter generates the feedback signal according to the decision result signal.

Equalizing apparatus and soft decision method

An echo discriminating method capable of discriminating whether an echo occurs in a communication channel is provided. The echo discriminating device includes: a channel estimation unit, that receives a baseband signal and generates a plurality of estimated channel responses according to a plurality of subcarriers of the baseband signal; a transforming unit, that transforms the estimated channel responses to generate a plurality of estimated channel frequency responses; a calculating unit, that calculates a representative value of each of the subcarriers to generate a plurality of representative values; a characteristic value generating unit, that generates a characteristic value according to the representative values; and a determining module, that determines whether the echo occurs according to the characteristic value and the representative values to obtain a determination result.

Echo discriminating device and method thereof

A method for calculating a feed forward equalizer coefficient of a feed forward equalizer in a minimum mean square error decision feedback equalizer (MMSE-DFE) based on a fast transversal recursive least squares (FT-RLS) algorithm is provided. The length of the feed-forward equalizer is L, which is a positive integer. The method includes an outer iteration having an Lnumber of iterations. The outer iteration includes an inner iteration having an n number of iterations, where n is an integer between 0 and (L&#x2212;2).

Method and device for calculating coefficients of feed-forward equalizer and feed-backward equalizer in decision feedback equalizer

A method for calculating an error of a sampling clock is provided. The sampling clock is used for sampling a signal to generate a first sample data group and a second sample data group. Each of the first and second sample data groups includes a header having a predetermined sequence. The method includes: performing a correlation operation on the first and second sample data groups with data of the predetermined format to obtain first and second correlation results, respectively; comparing the first and second correlation results to generate a sample data group offset; and generating the error of the sampling clock according to the sample data group offset and a time difference between the first and second sample data groups.

Circuit and method for calculating error of sampling clock, and signal receiving circuit and method

A correcting apparatus for timing recovery of a receiver is provided. The receiver includes a timing recovery module that outputs a first symbol and a second symbol. The correcting apparatus includes: a channel impulse response module, configured to generate a first set of peak times and a second set of peak times according to the first symbol and the second symbol, respectively; and a calculation module, configured to calculate a correction signal according to a relationship between the first and second sets of peak times and to send the correction signal to the timing recovery module.

Correcting apparatus for timing recovery of receiver and method thereof

A receiving apparatus applied to a receiving end of a communication device having an equalizer is provided. The receiving apparatus includes a filter and a channel estimator. The filter filters a received signal to reduce a multipath effect of the received signal and outputs a filtered signal. The channel estimator performs channel estimation on the received signal to generate an estimation result. The estimation result is for determining which of the received signal and the filtered signal is to be selected and sent to the equalizer.

Receiving apparatus and method for accelerating equalization convergence

A timing recovery apparatus for compensating a sampling frequency offset of an input signal is provided. The timing recovery apparatus includes a timing error corrector configured to generate an output signal according to the input signal and a calibration signal, a gain controller configured to adjust at least one of a signal edge low-frequency error component and a signal edge high-frequency error component of the output signal and accordingly generate an adjusted signal, a timing error detector configured to generate an error signal according to the adjusted signal, and a calibration signal generator coupled to the timing error detector and the timing error corrector, for generating the calibration signal according to the error signal and outputting the calibration signal to the timing error corrector to compensate the sampling frequency offset of the input signal.

Growing community of inventors

Hsinchu County, Taiwan

Chih-Cheng Kuo