Patent ID: 7151573
Filing Date: 2006-12-19
Classification: H04L,H04N

Abstract:
1. A channel equalizer for restoring an original signal from a digital television received signal that past through a channel, the channel equalizer comprising: a channel estimator for estimating an impulse response of a transmission channel from a received signal having past through the transmission channel; a channel distortion compensator for converting the received signal and the estimated impulse response of the transmission channel into frequency domain signals, setting a reciprocal of the estimated impulse response of the transmission channel in a frequency domain as an initial coefficient, receiving a channel equalized signal fed back in a data duration, calculating the error between equalized signal and decision value of the same equalized signal, updating the coefficients by using the error between equalized signal and decision value of the same equalized signal continuously, compensating distortion of the received signal converted into the frequency domain, and converting the compensated received signal back into a time domain; and a noise canceller for predicting a noise from an output of the channel distortion compensator, the noise being amplified when equalized, and eliminating the amplified noise contained in the time domain signal outputted from the channel distortion compensator.