Equalization apparatus and equalization method

Abstract

An equalization apparatus and equalization method capable of reducing power consumption and minimizing degradation in reception performance even when changes occur in the reception environment. Channel response estimator 101 estimates a channel response from a reference signal and a received signal and outputs the result to control circuit 102. In addition, error corrector and detector 104 detects error from a soft decision value after equalization processing of the received signal in equalizer 103 and outputs an error detection signal to control circuit 102. Control circuit 102 detects a response having the largest delay and larger power than the power level threshold among the channel responses, determines the number of trellis states by making channel responses up to that channel response having the largest delay valid, determines the number of taps necessary for equalization processing in accordance with the number of trellis states determined, controls the power level threshold from an error detection result, and, in the same way, determines the number of taps in channel response estimator 101.

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