Patent ID: 7408982

Claim:
An equalizer, comprising: an input signal reuse unit for inputting a training sequence stored during a training mode to a filter unit during a blind mode when an equalizer output signal is not converged to a predetermined value; a filter unit for receiving an output signal from the input signal reuse unit, the filter unit capable of compensating for distortion in the input signal in response to a error signal and a decision value, the filter unit further capable of outputting a result of the compensation as an equalizer output signal; and an error calculation unit for receiving the equalizer output signal, the error calculation unit capable of estimating the equalizer output signal, the error calculation unit capable of generating an estimate value as the decision value, the error calculation unit further capable of outputting a difference between the equalizer output signal and the decision value as the error signal, wherein the equalizer is configured to operate alternately in the training mode and the blind mode for a number of times smaller than a first adaptive number of loops and configured to initialize coefficients of the equalizer and operate in an input signal reuse mode for a number of times smaller than a second adaptive number of loops if the equalizer output signal is not converged after operating alternately in the training mode and the blind mode for the number of times smaller than the first adaptive number of loops.