Alpha稳定分布噪声下通信信号的载波频率估计  

Carrier frequency estimation of communication signals in Alpha stable distribution noise environment

作　　者：何继爱[1] 宋宇霄 陈兴[1,2] HE Jiai;SONG Yuxiao;CHEN Xing(School of Computer and Communication,Lanzhou University of Technology,Lanzhou 730050,China;School of Electronic and Information Engineering,Xi’an Jiaotong University,Xi’an 710049,China)

机构地区：[1]兰州理工大学计算机与通信学院,甘肃兰州730050 [2]西安交通大学电子与信息工程学院,陕西西安710049

出　　处：《华中科技大学学报（自然科学版）》2019年第2期47-51,共5页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：国家自然科学基金资助项目(61561031;61562058)

摘　　要：针对在Alpha稳定分布噪声环境下循环谱估计通信信号载波频率失效问题,提出了基于广义循环谱的载波频率估计方法.首先用非线性变换定义广义循环谱,并对信号幅度进行变换;然后利用非线性变换抑制夹杂在通信信号中的非高斯脉冲噪声.通过检测广义循环谱的谱线位置与数字调制信号载波频率的关系实现载波频率估计.通过Matlab仿真实验和性能分析对比,证明该方法可较好地在Alpha稳定分布噪声环境下估计通信信号的载波频率.Aiming at the problem of carrier frequency failure of communication signal in Alpha stable noise environment,a method of carrier frequency estimation based on generalized cyclic spectrum was proposed.First,a generalized cyclic spectrum was defined by using non-linear transformation,and the signal amplitude was transformed.This non-linear transformation suppresses non-Gaussian impulse noise in communication signals.Since the generalized cyclic spectrum does not change the cyclic frequency of the cyclic spectrum,the spectral structure of the signal is consistent with the original signal structure.Carrier frequency estimation was achieved by detecting the relationship between the spectral position of the generalized cyclic spectrum and the carrier frequency of the digitally modulated signal.The simulation results and performance analysis of Matlab shows that this method can estimate the carrier frequency of communication signal in Alpha stable noise environment,and it has certain feasibility.

关 键 词：通信信号 载波频率估计 ALPHA稳定分布 广义循环谱 非线性变换 

分 类 号：TN911.7[电子电信—通信与信息系统]