Transform domain adaptive filter, equalizer and wireless communication device using the same, and decision feedback equalization method

摘要

A transform domain adaptive filter (TDAF) is provided. The transform domain adaptive filter includes a filter device, a computing device and an adaptive algorithmic device. The filter device has a transform matrix device for pre-whitening an input signal to obtain a pre-whitened signal. The filter device restores the pre-whitened signal to a restored signal. The computing device compares the restored signal with a reference signal to obtain an error signal. The adaptive algorithmic device adjusts a filter coefficient of the filter device. The adaptive algorithmic device adopts the normalized least mean square (NLMS) algorithm.