基于循环谱的MPSK信号盲检测  

Blind Detection of MPSK Signals Based on Cyclic Spectrum

作　　者：郑鹏[1] 张鑫[1] 刘锋[1] 陶然[2] 

机构地区：[1]海军航空工程学院电子与信息工程系,山东烟台264001 [2]北京理工大学信息科学技术学院,北京100081

出　　处：《计算机仿真》2012年第4期130-133,137,共5页Computer Simulation

基　　金：国家自然科学基金(60232010);国家部委预研资助基金(41001020201)

摘　　要：针对MPSK信号在低信噪比、非合作条件下存在检测概率低的问题,提出了基于循环谱分析器的检测方法。方法根据MPSK信号循环平稳特性,通过在频率和循环频率双频率平面内的循环谱峰值特征搜索完成检测,不需要知道信号的编码序列、载频、码元宽度等先验参数,采用时域平滑实现循环谱估计,减小了计算量。仿真结果表明方法对MPSK信号具有较高的检测概率,而且证明数据长度的增加能够显著提高检测性能。To solve the problem of low detecting probability of MPSK signals in low SNR and non-cooperative circumstances,a novel method of detection based on cyclic spectrum analyzer（CSA） was proposed.The detection was realized by searching for the spectral peak on the biofrequency plane according to the cyclostationarity of MPSK signals under the condition of unknown code sequence,carrier frequency and chip width.The method has a small computing complexity as a result of temporally smoothing.The simulation results show that CSA has a high detecting probability for MPSK signals and the performance decreases as the modulation becomes complicated.The increase of data length can improve detecting performance remarkably.

关 键 词：循环谱 时域平滑 检测 

分 类 号：TN955[电子电信—信号与信息处理]