一种CDMA上行链路的半盲多用户检测器  

Group-blind multiuser detector for uplink in CDMA systems

作　　者：刘翔[1] 陈抗生[1] 

机构地区：[1]浙江大学信息与电子工程系,浙江杭州310027

出　　处：《浙江大学学报（工学版）》2002年第6期646-649,共4页Journal of Zhejiang University：Engineering Science

摘　　要：盲多用户检测器主要应用于仅知道目标用户扩频码时的检测,而在实际的CDMA上行链路情况下,基站接收器能够知道小区内所有用户的扩频码,但不知道小区外用户的扩频码.在此背景下,分析了纯盲多用户检测器与纯非盲多用户检测器的缺陷,并提出了一种结合互补型的半盲多用户检测器.将非线性Hopfield神经网络(Hop-fieldNeuralNetwork,HNN)检测器作为前级以去除小区内用户干扰,基于子空间理论的线性盲MMSE检测器作为后级以去除小区外用户干扰,提高了收敛速度,降低了计算复杂度.仿真结果表明,其比起纯盲检测器和纯非盲检测器都具有更优秀的检测性能.The combination of two multiuser detectors, the linear blind MMSE multiuser detector based on subspace methods and the nonlinear Hopfield Neural Network (HNN) multiuser detector, was analyzed for groupblind multiuser detection. All known users' information were fully utilized using HNN multiuser detector to suppress the interferers within the cell, and a blind MMSE multiuser detector was used to suppress the intercell interference. The performance of the proposed detector was found to have significantly better performance than that of the purely blind detectors and the nonblind detectors in a CDMA uplink environment.

关 键 词：半盲多用户检测器 盲MMSE检测 子空间方法 HNN检测 CDMA上行链路 CDMA通信系统 

分 类 号：TN914.53[电子电信—通信与信息系统]