Equalizer and equalization method

Abstract

An equalizer and an equalization method are provided which are capable of suppressing distortion specific to radio unit, and reducing both the oversampling number and the amount of calculations without causing characteristic deterioration. The equalizer, which equalizes a recived signal with periodically inserted known pilot symbols, includes a synchronization processing section 201 that detects symbol synchronization points using pilot symbols included in the recived signal, a plurality of equalization factor calculation sections A202, B203 and C204 which use the symbol synchronization points and points shifted in time before and after the symbol synchronization point as symbol synchronization point candidates, and calculate equalization factors for the respective symbol synchronization point candidates, and an optimization/equalization processing section 205 which selects an optimal symbol synchronization point and corresponding optimal equalization factor from among a plurality of symbol synchronization point candidates and corresponding equalization factors, and equalizes the recived signal using the optimal equalization factor.

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