一种变步长D-Rake多用户检测器  

A Variable Step-size Decorrelating Rake Multiuser Detector

作　　者：谢跃雷[1] 欧阳缮[1] 

机构地区：[1]桂林电子工业学院通信与信息工程系,广西桂林541004

出　　处：《桂林电子工业学院学报》2003年第3期68-71,共4页Journal of Guilin Institute of Electronic Technology

基　　金：国家自然科学基金资助项目(60172011);广西自然科学基金项目(gzk000711)

摘　　要：在时变多径衰落信道下,接收到的CDMA信号功率变化较大,此时D-Rake盲自适应多用户检测器性能显著下降,将变步长LMS算法与基于主分量的相干合并引入到D-Rake(DecorrelatingRake)检测器中,构成一种变步长D-Rake,称之为VD-Rake(Variablestep-sizeDecorrelatingRake)检测器。该检测器能克服原D-Rake检测器对信号功率变化较敏感等缺点,有效地改善了D-Rake检测器的性能。It has been found that the power of the received signal in a DSCDMA communication system is usually time varying due to multipath fading and the performance of the blind Decorrelating Rake (DRake) detector thus becomes considerably deteriorated.The authors of this paper propose a variable stepsize decorrelating Rake (VDRake) detector based on both the variable stepsize LMS and the principal component based coherent combiner.The VDRake detector is robust against the variation of the power of received signals.Simulations show that the proposed detector outperforms DRake detector and standard Rake detector in terms of the convergence speed and the BER in timevarying multipath fading channels.

关 键 词：CDMA 变步长LMS D-Rake 盲自适应多用户检测器 主分量 VD-Rake 第三代移动通信 MOE准则 

分 类 号：TN929.533[电子电信—通信与信息系统]