MPSK/MQAM符号速率估计算法及DSP实现  

Estimation Method of MPSK/MQAM Signal and Its Implementation with DSP

作　　者：尹曼[1] 陈兵[1] 

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》2015年第7期42-44,78,共4页Radio Engineering

摘　　要：针对多阶相移键控信号(MPSK)和多阶正交调幅信号(MQAM)符号速率快速高精度估计问题,在分析信号特征和连续小波变换原理的基础上,提出了一种基于小波变换的MPSK/MQAM符号速率快速估计算法。该算法通过对中频信号进行归一化处理,消除幅度变化的影响;利用固定尺度的小波变换将信号的相位跳变信息转换成其小波变换的幅度跳变信息,进而完成对符号速率的估计,并进行DSP实现验证。理论分析和仿真结果表明,在信噪比大于-10 d B条件下,算法达到较高的估计正确率和较小的估计均方误差,且DSP运行时间小于1 ms。This paper focuses on rapid and high accuracy estimation of Mary Phase Shift Keying（ MPSK） signal and Mary Quadrature Amplitude Modulation（ MQAM） signal. Based on analysis of MPSK and MQAM signal and Continuous Wavelet Transform（ WT）,a fast method for symbol rate estimation of MPSK and MQAM signal by using Wavelet Transform is presented. The method decreases the influence of amplitude changing by using normalization processing of IF signal,maps phase transient change information of MPSK /MQAM signal into magnitude transient change of its fixed scale Wavelet Transform for estimation of symbol rate,and the DSP implementation verification is performed. The theoretical analysis and simulation results show that the method can achieve high correct probability,small estimation RMSE and its DSP runtime is less than 1ms.

关 键 词：小波变换 MPSK/MQAM信号 FFT 符号速率盲估计 

分 类 号：TN971.1[电子电信—信号与信息处理]