应用判决反馈的混合信号单通道盲分离算法

摘要

This paper proposed a decision feedback-based PSP (DF-PSP)single channel blind separation algorithm.In this algorithm,the preliminary decisions,which are obtained by the most probable surviving sequence from the Viterbi de-tector,are used to synthesize the intersymbol interference caused by the tail of channel impulse response,thus to make up the performance loss resulted from the channel impulse response’s truncating processing of existing per-survivor processing algorithm for single channel blind separation.The simulation results show that DF-PSP is superior to the PSP algorithm for single channel blind separation algorithm at the same complexity in processing mixed QPSK signals and about 2dB signal-noise ratio gain can be obtained at a bit error rate of 5 ×1 0-3 ,also this algorithm can obtained better performance increase in same oversampling ratio.%该文提出了一种基于判决反馈思想的DF-PSP单通道盲分离算法。该算法结合判决反馈的思想，利用Viterbi序列检测器最可能的幸存序列得到的预判决来合成信道冲激响应尾部造成的符号串扰，来弥补现有PSP单通道盲分离算法对信道冲激响应进行截断处理而带来的性能损失。仿真结果表明，对于两路混合QPSK信号，该算法较截断PSP单通道盲分离算法在复杂度相当的条件下有更好的性能，在误码率为5×10－3时，信噪比改善可达到2dB左右，且在同等过采样条件下，该算法能获得更好的性能提升。