基于相位旋转的高阶多路MPSK信号的盲分离

Phase-rotation Based Blind Separation Algorithm for Multiple Co-Channel MPSK Signals

本文针对高阶多路混合MPSK信号的盲分离问题,分析了MPSK接收信号的特性,给出了源信号个数估计定理,在对观测信号进行删余预处理后,利用改进的混合聚类算法估计出源信号数目,然后提出了一种相位旋转算法,消除接收信号中的公共因子,去除相位角不趋于零的元素,将高阶多路MPSK信号盲分离转化为BPSK信号盲分离,利用BPSK盲分离算法即可实现多路MPSK信号的盲分离。仿真结果验证了该算法的有效性。

In this paper,the problem of blind separation of mixed high order modulation MPSK signals is considered.The properties of received MPSK signals are analyzed and an estimation method for the number of sources is proposed based on clustering.The number of sources is given after the received MPSK signals are preprocessed and punctured.Then after the phase rotation and eliminating common factors,the multiple co-channel mixed MPSK signals can be separated by using the algorithm for the blind separation of BPSK signals.Simulation results show that the proposed algorithm is effective.