基于乘积性多尺度小波变换的MPSK信号码速率估计  

MPSK signal code rate estimation based on product CWT with multi-scales

作　　者：李利[1] 王平军[1] 武登科 彭巧乐[3] 

机构地区：[1]海军大连舰艇学院作战指挥系,辽宁大连116018 [2]海军训练舰支队,辽宁大连116018 [3]上海航天局第802研究所,上海200090

出　　处：《大连海事大学学报》2011年第2期106-109,112,共5页Journal of Dalian Maritime University

基　　金：国防基础科研基金资助项目(A2420061104-06)

摘　　要：为估计MPSK信号的码速率,提出一种基于乘积性多尺度小波变换的MPSK信号码速率估计算法.首先,采用载频估计值将接收信号下变频至基带;然后选取多个不同尺度分别对基带信号做Haar小波变换以检测相位突变点,对多个尺度下小波变换的模做乘积性运算,显著凸显突变点的位置,极大削减了噪声;最后,对乘积性结果做快速傅里叶变换(FFT),便可得到MPSK信号的码速率.仿真实验表明,该方法可以在较低信噪比下估计MPSK信号的突变点和码速率,体现了良好的估计性能和优良的低信噪比性能.An estimating method for MPSK signal code rate estimation based on product multi-scale wavelet transform（WT） was proposed.Firstly,the estimated value of carrier frequency was used to take the received signals down-conversion to baseband,then the phase singularities were detected through transforming baseband signal into Haar WT in several different scales.The product modulus of WT could extract singularities and weaken noise significantly.Finally,the FFT of the product result could estimate the symbol rate of MPSK signal.Simulation experiments prove that the method can estimate singularities and symbol rate of MPSK signals in lower SNR,which has good estimation performance and excellent low SNR performance.

关 键 词：小波变换(WT) 码速率 移相键控(PSK)信号 多尺度 

分 类 号：TN957.51[电子电信—信号与信息处理]