在移动通信系统中,由于衰落和多普勒效应,为了实现基于Viterbi算法的极大似然序列估计(MLSE),需要不断跟踪信道参数变化.本文首先提出了一种新的基于插值的信道估计方法ICP(Interpolating channel processing),并给出了该方法的两种实现形式,同已有的一些算法的比较结果表明:新方法具有更小的计算复杂度,误码率更低.同时,本文对如何降低Viterbi算法(VA)的计算复杂度也作了探讨.通过采用自适应减小计算复杂度的算法(ATA),本文提出的ICP算法具有更优的性能.

In mobile communication system,a continuous channel estimation and tracing method is needed to implement the Viterbi algorithm of MLSE because of fading and Doppler effect.In this paper,we propose a novel MLSE receiver based on interpolating channel processing (ICP).To reduce the computational complexity of VA,we use an effective method named-adaptive threshold algorithm (ATA).A comparison in performance and computational cost is given with two other reference algorithms:Per-survivor Processing and Minimum Survivor Processing.