基于小波变换的MPSK短信号符号率估计  

Symbol rate estimation of MPSK short signals based on wavelet transform

作　　者：苏志金[1] 许建华[2] 韩民[1] 

机构地区：[1]山东大学信息科学与工程学院,济南250100 [2]中国电子科技集团公司第四十一研究所,青岛266500

出　　处：《电子测量与仪器学报》2013年第2期140-144,共5页Journal of Electronic Measurement and Instrumentation

基　　金：国家重点基金(9140A170301)资助项目

摘　　要：跳频通信是非协作通信的常见形式,信号解跳后,准确地估计出符号率是实现正确解调的关键。保密通信中,为了保证信号的低截获率,发射信号往往持续时间短,且跳频时隙的符号数少,现有的方法针对此类信号进行符号率估计性能不佳。文章提出了一种结合带宽估计、小波变换与统计分析理论的新方法,利用小波的奇异性检测特性,结合带宽估计选择小波尺度,检测出符号的持续时间,并进行统计分析,进而精确估计出信号符号率。仿真实验表明,该方法有较高的精确度及抗噪性。Frequency hopping communication is a common form of non-cooperative communication. Accurately estimated symbol rate is the key point to achieve the correct demodulation of digital signals after de-hopping. In secure communications, in order to ensure low interception rate, the transmitted signals often last for a short time with few symbols in hopping pulse. Existing symbol rate estimation algorithms for such signals perform poor. To solve the problems, a new method of combination of bandwidth estimation, wavelet transform and statistical analysis is presented in this paper. The wavelet scale is selected utilizing bandwidth estimation, and the symbol duration can be detected and analyzed statistically, then the symbol rate of the signal can be estimated accurately. The simulation results show that this method has higher accuracy and is robust to noise.

关 键 词：跳频通信 小波变换 符号率估计 

分 类 号：TN911.7[电子电信—通信与信息系统]