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.
出处
《电路与系统学报》
CSCD
北大核心
2007年第5期115-119,共5页
Journal of Circuits and Systems
基金
国防预研项目(41101030103)
关键词
通信对抗
MPSK信号
解调
循环平稳
communication countermeasure
MPSK signals
demodulation
cyclostationary
