一种CPM信号的符号速率估计算法  

A Symbol Rate Estimation Algorithm of CPM Signals

作　　者：王秀宁[1] 陈卫东[1] 刘芳[1] WANG Xiu-ning CHEN Wei-dong LIU Fang(The 54th Research Institute of CETC, Shijiazhuang Hebei 050081, China)

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2017年第2期36-40,共5页Radio Engineering

基　　金：国家自然科学基金资助项目(81370038)

摘　　要：在非合作通信中,调制参数估计是信号盲解调的必要前提,符号速率就是其中的一个重要参数。对于连续相位调制(Continuous Phase Modulation,CPM)信号,符号速率的精确估计对于信号的盲识别、参数估计及盲解调等都具有重要的意义。针对符号速率估计中存在的问题,提出了一种基于瞬时频率的符号速率估计算法,通过相位差分求取信号的瞬时频率,对瞬时频率值进行快速傅里叶变换得到瞬时频率谱,并根据瞬时频率谱求出符号速率的估计值。仿真实验结果表明,该算法不需要较大的数据量,且识别速度快,具有很好的抗噪声性能。In non-cooperative communication,the modulation parameter estimation is the prerequisite for blind demodulation,and the symbol rate is one of the most important parameters.For continuous phase modulated signal,a precise estimatation of symbol rate is of great significance to signal blind recognition,parameter estimation and blind demodulation.Considering the problems on symbol rate estimation during parameter estimation,a new algorithm based on the instantaneous frequency spectrum is introduced in this paper.This algorithm obtains the instantaneous frequency of signal by the phase difference, performs fast Fourier transformation for instantaneous frequency to get the instantaneous spectrum and the symbol rate estimation according to instantaneous spectrum.The simulation results show that the algorithm can be implemented with small amount of data,and it has a fast recognition speed together with a good noise resistant performance.

关 键 词：符号速率估计 盲识别 连续相位调制 瞬时频率 

分 类 号：TP391.4[自动化与计算机技术—计算机应用技术]