空间激光通信中变步长CMA-LMS均衡算法  

CMA-LMS equalization algorithm with variable step size in space laser communication

作　　者：佟欣 刘智[1,2] 高思远 TONG Xin;LIU Zhi;GAO Siyuan(School of Electronic and Information Engineering,Changchun University of Technology,Changchun 130022,China;Institute of Space Optics and Electronics,Changchun University of Technology,Changchun 130022,China)

机构地区：[1]长春理工大学电子与信息工程学院,长春130022 [2]长春理工大学空间光电技术研究所,长春130022

出　　处：《光通信技术》2020年第7期36-39,共4页Optical Communication Technology

基　　金：吉林省科技发展计划项目(20170521001HJ)资助。

摘　　要：针对空间激光通信中无线光信号传输过程的串扰以及噪声问题,提出一种结合恒模算法(CMA)和最小均方(LMS)算法的两级级联变步长自适应均衡算法——CMA-LMS均衡算法,使步长因子的大小在一定范围与理论呈非线性关系。利用理论数据和步长因子的乘积对算法变量进行更新,实现信道的非线性自适应均衡。实验结果表明:CMA-LMS均衡算法能够提高系统的性能;在16阶正交幅度调制(16QAM)下,CMA-LMS均衡算法能够有效抑制系统的噪声和串扰问题。Aiming at the crosstalk and noise problems of wireless optical signal transmission in space laser communication,combined with constant modulus algorithm(CMA)and least mean square(LMS)algorithm,a two-stage cascade variable step size adaptive equalization algorithm——CMA-LMS equalization algorithm is proposed,the size of the step factor has a nonlinear relationship with the theory in a certain range.The product of the theoretical data and the step factor is used to update the algorithm variables to achieve the nonlinear adaptive equalization of the channel.The experimental results show that the CMA-LMS equalization algorithm can improve the performance of the system,and under 16 quadracture amplitude modulation(16QAM),CMA-LMS equalization algorithm can effectively suppress the noise and crosstalk of the system.

关 键 词：自适应滤波 空间激光通信 均衡 步长因子 恒模算法 

分 类 号：TN929.12[电子电信—通信与信息系统]