基于瞬时相位差分的MFSK符号率估计方法  

Symbol Rate Estimation Method for MFSK Signals Based on Instantaneous Phase Difference

作　　者：许华[1] 江汉[1] 闫哲[2] 

机构地区：[1]空军工程大学信息与导航学院,西安710077 [2]北京理工大学机电工程与控制国家重点实验室,北京100081

出　　处：《科学技术与工程》2014年第29期244-248,共5页Science Technology and Engineering

基　　金：国家自然科学基金(61001111)资助

摘　　要：对数字通信信号的符号速率估计是电磁频谱监控、通信侦察分析等非合作接收领域的重要研究内容。提出了一种MFSK信号的符号速率估计新方法,通过对信号样本求取瞬时相位差分并联合非线性变换及小波分析的方法,实现了对符号速率的准确检测,并大大提高了估计方法在低信噪比条件下的适应性;在此基础上进一步提出了低信噪比条件下基于估计结果后处理的性能改进方法,能够再提高3 dB的估计性能。仿真验证了新算法和改进方法在低信噪比条件下的估计性能。The symbol rate estimation for digital communication signals is an important research content of uncooperate receiving region such as electromagnetic spectrum suveillance and communication reconnaissance.A novel symbol rate estimation method by computing the instantaneous phase difference sequence and combining nonlinear transformation and wavelet analysis method is presented,which have great performance improvement in low SNR.Furthermore,the method of performance improvement for low SNR based on post-processing the estimation results is presented,and it can promote the estimation performance by another 3 dB.At last,the performance of the novel estimation algorithm and further improving method are validated by computer simulation.

关 键 词：低信噪比 符号速率估计 小波分析 非线性变换 瞬时相位 

分 类 号：TP391.9[自动化与计算机技术—计算机应用技术]