高速数据传输系统中，8PSK为常用的调制方式。为了满足更高的误码率指标，本文对软判决算法进行了深入的研究，并针对两种不同的软判决算法进行了误码率仿真。-high-speed data transmission system, commonly used for 8PSK modulation. In order to meet the higher rate of error, this pair of soft decision algorithm for the in-depth study targeted at two different soft decision algorithms for BER simulation.