Blind equalizers for multipath channels with best equalization delay

Abstract

Previous studies show that equalizers with different equalization delays achieve different performances. The best performed equalizer is not necessarily the one with 0-delay, and often not the case when the channel is non-minimum-phase. In this paper, a blind channel equalization algorithm is presented, by which equalizers with all possible equalization delays can be calculated simultaneously from the second order statistics of the received signals. A (blind) evaluation index is then presented for the purpose of selecting the best equalizer. Simulation shows that the best delayed equalizer performs much better than that for other equalization delays and those given by constant modulus algorithm and linear prediction algorithm.