Patent Number:
7,042,935
Title:
Equalizer and equalization method
Abstract:
An equalizer and an equalization method 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 received signal with periodically inserted known pilot symbols, includes a synchronization processing section that detects symbol synchronization points using pilot symbols included in the received signal, a plurality of equalization factor calculation sections 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 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 received signal using the optimal equalization factor.
Inventors:
Kawahara; Nobuaki (Tokyo, JP), Naito; Masashi (Tokyo, JP)
Assignee:
Hitachi Kokusai Electric, Inc.
International Classification:
H03H 7/30 (20060101)
Expiration Date:
5/09/02018