衰落信道中的DS/CDMA系统盲差分自适应接收机  

A Blind Differential Adaptive Receiver for DS/CDMA Systems in Fading Channels

作　　者：陈致樑[1] 尹俊勋[1] 吴冬生[2] 

机构地区：[1]华南理工大学电子与通信工程系,广东广州510641 [2]香港大学电机及电子工程系

出　　处：《电讯技术》2002年第3期14-17,共4页Telecommunication Engineering

基　　金：广东省重点科技攻关项目 (992 2 0 0 3)

摘　　要：在本文中 ,我们针对标准MMSE自适应接收机在频率非选择性衰落信道中的相位滑动和失锁问题 ,提出了一种无需进行训练和信道参数估计的盲差分自适应接收机。为自适应地实现该接收机 ,我们同时提出了一种基于正交分解的盲平均随机梯度 (OrthogonalDecomposition -basedBlindAver agedstochasticGradient ,简称ODBAG)算法。仿真结果表明 ,这种以ODBAG算法实现的盲差分自适应接收机在瑞利 (Rayleigh)衰落信道中 ,误码率性能比传统匹配滤波器 (MatchedFilter ,简写为MF)接收机有显著的提高 ,并接近改进的MMSE自适应接收机的性能。It is known that the standard MMSE receiver will often lose phase lock on the desired signal when the desired signal dips into a deep fade in frequency-nonselective-fading channels. To overcome above problem, a differential blind adaptive receiver is proposed. In addition, the Orthogonal Decomposition-based Blind Averaged stochastic Gradient (ODBAG) algorithm is proposed to implement the blind differential adaptive receiver adaptively. Through computer simulation, it is shown that the proposed receiver provides bit error rate performance significant over the match filter receiver and comparable to the modified MMSE receiver with perfect phase recovery.

关 键 词：盲差分自适应接收机 DS/CDMA 衰落信道 MMSE接收机 盲检测 盲平均随机梯度算法 

分 类 号：TN914.5[电子电信—通信与信息系统]