基于变步长LMS的自适应匹配算法  

Adaptive Matched Demodulation Algorithm Based on LMS with Variable Step Size

作　　者：曾召华[1] 刘贵忠[1] 

机构地区：[1]西安交通大学信息与通信工程系

出　　处：《电子与信息学报》2004年第2期241-247,共7页Journal of Electronics & Information Technology

基　　金：教育部高等学校博士学科点专项科研基金(No.2000069828);陕西省教委自然科学专项基金(No.03jk168)资助课题

摘　　要：基于最小均方误差准则,提出了一种用于抑制异步直扩CDMA系统中的多址干扰的变步长LMS自适应匹配算法。计算机仿真结果表明,基于该类算法的自适应解扩多用户检测器无须知道任何用户的地址码,具有良好的抗“远近效应”能力,与类似的变步长LMS算法相比,该算法具有更低的误码率、更快的收敛速度和跟踪速度,特别是其控制参数在信道参数发生变化时不需重新调整,同时具有广泛的应用前景。Based on Minimum-Mean-Square-Error(MMSE) criterion, a kind of LMS algorithm with variable stop size is proposed to suppress Multi-Access Interference (MAI) in asynchronous DS-CDMA system. Compare with similar variable step size LMS algorithm, computer simulation results show that the kind of detector is insensitive to the near-far effect and its structure is very simple. At the same time, it has lower bit error rate and faster speed of convergence and tracking without increasing computational complexity. In particular, the controlling parameters of proposed algorithm are not required to re-adjust, even if the channel parameter changes. So it can be widely used.

关 键 词：最小均方误差准则 CDMA 多址干扰 变步长LMS 自适应匹配算法 自适应接收机 

分 类 号：TN929.533[电子电信—通信与信息系统] TN911.7[电子电信—信息与通信工程]