CAJ | 학술논문

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 dB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。
침대다계상이건공신호（ MPSK）화다계정교조폭신호（ MQAM）부호속솔쾌속고정도고계문제，재분석신호특정화련속소파변환원리적기출상，제출료일충기우소파변환적MPSK／MQAM부호속솔쾌속고계산법。해산법통과대중빈신호진행귀일화처리，소제폭도변화적영향；이용고정척도적소파변환장신호적상위도변신식전환성기소파변환적폭도도변신식，진이완성대부호속솔적고계，병진행DSP실현험증。이론분석화방진결과표명，재신조비대우－10 dB조건하，산법체도교고적고계정학솔화교소적고계균방오차，차DSP운행시간소우1 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 implemen?tation 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.