关键词: 瑞利衰落, 最大似然序列检测(MLSE), 信道估计, 逐幸存处理

Abstract:

Considering the effects of multipath and Doppler frequency shift in the digital mobile communication,the paper establishes a time-varying Rayleigh fading channel model and uses the maximum likelihood sequence detection algorithm to achieve equalization.Its basic idea is to insert the channel estimation algorithm into the MLSE algorithm,and then track and update the changes of the channel continuously.To lower complexity,this paper studies the conventional adaptive MLSE and per-survivor processing MLSE algorithm.Simulation shows that when the Doppler frequency shift is small,the two algorithm has similar performance with the former less complex.

Key words: Rayleigh fading;maximum likelihood sequence estimation;channel estimation;per-survivor processing