基于循环平稳分析的MPSK信号接收  

Algorithm for demodulation of MPSK signals based on cyclostationary

作　　者：罗明[1] 杨绍全[1] 魏青[1] 

机构地区：[1]西安电子科技大学电子工程学院,陕西西安710071

出　　处：《电路与系统学报》2007年第5期115-119,共5页Journal of Circuits and Systems

基　　金：国防预研项目(41101030103)

摘　　要：提出了一种新的MPSK信号解调算法。通过对预处理后的MPSK信号进行循环平稳分析,利用已调信号的4阶循环累积量估计载波频率和初始相位偏差以便实现正交解调。由于高阶循环统计量具有抗平稳噪声的能力,因此在循环累量域有较高的参数估计精度。采用小波变换估计基带信号的码元速率,通过抽样判断产生再生基带信号从而实现了信号的盲解调。这种解调算法无需信号参数的先验信息,理论分析和实验结果证实了算法的有效性。A new algorithm is proposed for demodulation of MPSK signals. This method analyzes the cyclostationary of pretreated signals. In order to realize quadrature demodulation, the 4th-order cyclic cumulant is used to estimate carrier frequency and phase deviation. Because cyclic higher-order statistics can depress stationary noise, higher estimated accuracy can be obtained. Wavelet transform is used to estimate code rate. Through judgement sampling, blind demodulation is realized. This method doesn＇t require prior information of received MPSK signals. Theoretical analysis and practical signal processing justify the efficiency of the new demodulation algorithm.

关 键 词：通信对抗 MPSK信号 解调 循环平稳 

分 类 号：TN911.72[电子电信—通信与信息系统]