脉冲噪声衰落信道下MPSK信号的符号周期估计  

Estimation of the symbol period of MPSK signals over fading channels with impulsive noise

作　　者：张俊林 刘明骞[1,2] ZHANG Junlin;LIU Mingqian(National Key Lab.of Radar Signal Processing,Xidian Univ.,Xi5an 710071,China;Collaborative Innovation Center of Information Sensing and Understanding,Xidian Univ.,Xi5an 710071,China)

机构地区：[1]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071 [2]西安电子科技大学信息感知技术协同创新中心,陕西西安710071

出　　处：《西安电子科技大学学报》2018年第5期38-42,95,共6页Journal of Xidian University

基　　金：国家自然科学基金资助项目(61501348,61271299);国家博士后科学基金资助项目(2017M611912);陕西省自然科学基础研究计划资助项目(2016JQ6039);江苏省博士后科研资助计划资助项目(1701059B);高等学校学科创新引智计划资助项目(B08038)

摘　　要：针对脉冲噪声环境衰落信道下相移键控信号符号周期估计困难的问题,提出了一种基于分数低阶循环谱相干系数的相移键控信号符号周期估计方法.首先,对相移键控信号进行分数低阶循环平稳特性分析,并给出相移键控信号的分数低阶循环谱相干系数表达式;然后,分析了相移键控信号符号周期与分数低阶循环谱相干系数之间的关系;最后,给出相移键控信号符号周期估计流程.仿真结果表明,在脉冲噪声环境衰落信道下,所提的符号周期估计方法具有良好的估计性能.In order to solve the problem of the difficulty in blind estimation of the symbol period for Multiple phase-shift keying (MPSK) signals over fading channels under impulsive noise environment,a novel symbol period blind estimation method based on the fractional low order cyclic correlation coefficient is proposed.First,the analytical expressions for the fractional low-order cyclic stationary characteristic are derived by using the cyclostationarity of MPSK.And then, the relationship between symbol period of MPSK signals and fractional low-order cyclic spectral coherence function is presented. Finally, the process of the symbol period estimation method for MPSK is constructed. Simulation results show that the proposed method has a good estimation performance over fading channels under impulsive noise environment.

关 键 词：脉冲噪声 衰落信道 参数估计 符号周期 分数低阶循环平稳性 

分 类 号：TN911.7[电子电信—通信与信息系统]