Patent ID: 7773700

Claim:
A channel equalization method for restoring an original signal from a digital TV reception signal having passed through a channel, the channel equalization method comprising: selecting an estimation signal from one of a previously stored training sequence in a training signal section of a received signal or a decision value of a noise-removed signal in a data section; estimating an impulse response of the channel from the received signal having passed through the channel using a conjugate-gradient algorithm; wherein the channel impulse response is estimated using the estimation signal; determining an equalizer coefficient in a frequency domain using the estimated impulse response of the channel; transforming the received signal to a frequency domain signal; outputting an equalized signal by multiplying the frequency domain signal by the determined equalizer coefficient; and removing an amplified noise of the equalized signal using the conjugate-gradient algorithm in a time domain, wherein the estimating of the impulse response of the channel further comprises determining a point having a minimal mean square error on a mean square error plane to estimate the channel impulse response using the conjugate-gradient algorithm which finds a solution by moving only once in one direction on the mean square error plane.