MPSK混合信号逐步消除前向干扰的单通道盲分离PSP算法

Single channel blind separation PSP algorithm of eliminating forward interference step-by-step for MPSK mixed signals

在日益复杂的电磁环境中,时常会遇到信号混叠的情况,如何把混叠信号成功高效地分离开来成为近年来研究的热点。就逐留存路径处理(per-survivor processing,PSP)算法分离两路同频相移键控混叠信号复杂度较高的问题进行了研究,在前人研究的基础上提出多进制相移键控(m-ary phase shift keying,MPSK)混合信号逐步消除前向干扰的单通道盲分离PSP算法。仿真结果表明,在大约0.5dB的性能损失下,若以每分离一个混合信号所需遍历的状态数M2(L-1)(其中,M是信号的调制阶数,L是两路混合信号的码间串扰长度),作为衡量PSP算法复杂度标准,所提算法分离两路二进制相移键控混合信号的复杂度较原有的算法降低了4倍,分离两路正交相移键控混合信号的复杂度较原有的算法降低了16倍,大幅度地降低了混叠信号分离的复杂度,提升了同频相移键控的混叠信号的分离效率。

The situation of mixed signals often occurs in the deteriorating electromagnetic environment,therefore how to separate the mixed signals successfully and efficiently has become a hot research in recent years.The high complexity of the per-survivor processing（PSP）algorithm that is used to separate the two phase shift keying mixed signals with the same frequency is studied.On the basis of previous studies,the single channel blind separation PSP algorithm of eliminating forward interference step-by-step for m-ary phase shift keying（MPSK）mixed signals is proposed.Simulation results show that,if the number of traversing states for every separation of a mixed signals is M2（L-1）regarding as a measure of the complexity of the PSP algorithm,where Mis the modulation order of the signal,and Lis the intersymbol interference length of two mixed signals,the complexity of the proposed algorithm for separating two binary phase shift keying（BPSK）mixed signals is four times lower than that of the original algorithm,and the complexity of separating two quadrature phase shift keying（QPSK）mixed signals is 16 times lower than that of the original algorithm.In the result,the proposed algorithm reduces the computational complexity of mixed signal separation greatly,so that the efficiency of separation of phase shift keying with the same frequency mixed signal has been improved.