Adaptive equalization apparatus and method

摘要

An adaptive equalization apparatus comprises a sync word generator (12) for delivering a sync word signal which is the same as a sync word signal in a received signal from a transmitter. A correlator (13) calculates a correlation between the received signal and the sync word signal to deliver a correlation value as a correlation output signal. A power variance measuring unit (131) receives the correlation output signal and a threshold value as inputs, and determines a mean value and a variance of the correlation output signal within a given time span while shifting the time span in the time domain, and for delivers the variance at a timings at which the mean value is greater than the threshold value. A symbol sync timing generator (133) generates a symbol sync timing signal on the basis of that timing, and a sampler samples the received signal using the symbol sync timing signal. An adaptive equalizer (63) receives the signal samples input and applies an adaptive equalization to the signal samples to deliver a decided symbol.