基于余弦窗变换的MPSK和QAM信号的码速率估计  

Symbol Rate Estimation Based on Cosine Window Transform for MPSK and QAM Signals

作　　者：郑文秀[1] 杨绍全[1] 赵国庆[1] 张煜[1] 

机构地区：[1]西安电子科技大学电子对抗研究所,西安710071

出　　处：《电子信息对抗技术》2006年第5期7-10,39,共5页Electronic Information Warfare Technology

摘　　要：电子对抗的实际应用中为了完成信号的分类、解调任务,需要精确估计截获信号的码速率。针对数字通信中常见的MPSK、QAM信号,提出了一种基于余弦窗变换的码速率估计新算法。利用余弦窗变换确定信号相位跳变位置,进而利用谱分析精确估计码速率。理论分析证明了算法的有效性。仿真试验表明,当信噪比大于5dB时算法是有效的,且优于采用小波变换的方法。In the actual application of electronic countermeasures, the accurate estimation ot symbol rate is required for the captured signals＇ classification and demodulation. A novel algorithm based on the cosine window transform （CWT） is proposed to estimate the symbol rate for the usual signals, MPSK and QAM in communication. The signal＇ s phase changes are located by the use of CWT, and then the spectral analysis will be used for the accurate estimation. Theoretical analysis proves the validity of the proposed algorithm. Simulation shows that it is efficient when SNR is greater than 5dB and better than the algorithm using the wavelet transform （WT）.

关 键 词：电子对抗 信号检测 特征提取 数字通信 

分 类 号：TN911.72[电子电信—通信与信息系统]