一种基于CMA和DDLMS算法的双模式盲均衡算法  

A Dual-mode Blind Equalization AlgorithmBased on CMA and DDLMS Algorithm

作　　者：胡婉如 梅如如 崔健[3] 王竹刚 HU Wanru;MEI Ruru;CUI Jian;WANG Zhugang(National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Information,North China University of Technology,Beijing 100144,China)

机构地区：[1]中国科学院国家空间科学中心,北京100190 [2]中国科学院大学,北京100049 [3]北方工业大学信息学院,北京100144

出　　处：《电讯技术》2021年第1期83-88,共6页Telecommunication Engineering

基　　金：中国科学院战略性先导科技专项(A类)(XDA15350103)。

摘　　要：为进一步改进盲均衡算法收敛速度慢、稳态误差大、计算复杂度高等问题,提出一种切换模式和加权模式联合CMA(Constant Modulus Algorithm)+DDLMS(Direct Decision Least Mean Square)双模式盲均衡算法。综合切换双模式盲均衡算法和加权双模式盲均衡算法的优缺点,对切换、加权模式联合的CMA+DDLMS双模式盲均衡算法进行仿真。在不同信噪比条件下,对CMA算法、MCMA(Modified CMA)算法、DDLMS算法和CMA+DDLMS双模式盲均衡算法进行仿真,结果表明,所提算法收敛速度快,约为600个符号;稳态误差小,约为0.1;误码率小,在信噪比为25 dB时,误码率约为10-6。该算法可广泛应用于无线通信、光通信、声呐和雷达等众多领域。In order to solve the problem of slow convergence speed,large steady-state error and high computational complexity of blind equalization algorithm,the constant modulus algorithm(CMA)+direct decision least mean square(DDLMS)dual-mode blind equalization algorithm combining switching mode and weighted mode is proposed.By combining the advantages and disadvantages of the switching dual-mode blind equalization algorithm and the weighted dual-mode blind equalization algorithm,the CMA+DDLMS dual-mode blind equalization algorithm combining switching mode and weighted mode is simulated.Under different signal-to-noise ratio(SNR)conditions,the CMA blind equalization algorithm,MCMA blind equalization algorithm,DDLMS blind equalization algorithm and CMA+DDLMS dual-mode blind equalization algorithm are simulated,and the results show that,the convergence speed of the algorithm is fast,about 600 symbols;the steady-state error is small,about 0.1;and the symbol error rate is small,about 10-6 when the SNR is 25 dB.The algorithm can be widely used in wireless communication,optical communication,sonar,radar and many other fields.

关 键 词：卫星通信 信道均衡 CMA+DDLMS盲均衡 切换模式 加权模式 

分 类 号：TN911.5[电子电信—通信与信息系统]