一种用于信号侦测的码元速率估计方法  

On Symbol Rate Estimation for Signal Reconnaissance

作　　者：罗明[1] 杨绍全[1] 郑文秀[1] 魏青[1] 

机构地区：[1]西安电子科技大学电子工程学院,西安710071

出　　处：《电子对抗技术》2005年第5期3-6,共4页

基　　金："十五"国防预研基金项目(41101030103)

摘　　要：提出了一种数字通信信号码元速率的估计算法。对截获接收机输出的调制信号提取基带信号,利用此基带信号小波变换系数的模值,构造与原调制信号码速率一致的单极性脉冲序列。通过对此单极性脉冲序列的功率谱分析可知,在基带信号码元速率的整数倍处存在离散谱线,检测这些离散谱线即实现了信号码元速率的估计。这种算法能在低信噪比下估计信号的码元速率。理论分析和实际信号处理证明了本文提出算法的可行性。A new algorithm is proposed for symbol rate estimation of digital communication signals. This lnethod extracts baseband signal of lnodulation signal by means of different ways. Then Haar wavelet transform is used to detect singular point of baseband signal. Theoretical analysis indicates the sequence of coefficient module of Haar wavelet transform has discrete spectral lines in the power spectrm. Symbol rate estimation is realized by detecting discrete spectral lines. The method can work with lower SNR. Theoretieal analysis and practical signal processing justify the effectiveness of the new symbol rate estilnatio, algorithm.

关 键 词：通信对抗 数字通信信号 码元速率估计 小波变换 

分 类 号：TN911.72[电子电信—通信与信息系统] TN975[电子电信—信息与通信工程]