采用非线性变换的MPSK/MQAM符号速率盲估计  

Blind Estimation of MPSK/MQAM Symbol Rate with Nonlinear Processing

作　　者：张海瑛[1] 袁超伟[2] 

机构地区：[1]中国电子科技集团公司第五十四研究所,石家庄050081 [2]北京邮电大学信息与通信工程学院,北京海淀区100876

出　　处：《电子科技大学学报》2010年第6期820-825,共6页Journal of University of Electronic Science and Technology of China

基　　金：国家自然科学基金(60672132)

摘　　要：提出了一种采用非线性变换的MPSK/MQAM类信号符号速率盲估计方法,充分利用了MPSK/MQAM数字信号相邻符号的相位变化信息,通过对零中频信号进行非线性处理,构造一个非线性变换的复数函数,生成含有符号速率的离散谱线。利用四阶累积量的方法实现在强背景噪声下提取符号速率的基频分量。该方法运算简单,适应性好,对MQAM和MPSK调制的不同阶数、不同成形滤波器系数的信号均适用,低信噪比下仍具有很好的测量性能。A blind method for symbol rate estimation of MPSK/MQAM signals by using the nonlinear process is presented.Utilizing the phase changing between inter-symbols and through the nonlinear transforming of zero IF signals,the spectral lines corresponding to the symbol rate can be extracted.The fourth-order cumulant is used for suppressing the strong background noise of symbol rate spectral lines in this paper.This method is robust to Gaussian noise and can achieve good estimation results with lower SNR.At the same time,it has lower computational complexity and is applicable to different shaping filters and different modulation orders of MPSK/MQAM signals.

关 键 词：延时相乘 四阶累积量 MPSK/MQAM信号 非线性变换 相位跳变 符号速率估计 

分 类 号：TN911.72[电子电信—通信与信息系统]