两种新的码分多址多用户检测器

TWO NEW MULTIUSER DETECTORS IN CDMA CHANNEL

通过分析同步码分多址通信中多用户检测器存在的多址干扰和ｎｅａｒ－ｆａｒ问题，提出了已知信号能量情况下运算量较小的递推反馈检测器（ＲＦＤ）．它利用检测出的强用户信号逐级反馈消除多址干扰和ｎｅａｒ－ｆａｒ．在未知信号能量情况下，提出利用相关器输出峰值平滑估计信号能量，从而得到具有一定能量跟踪特性的峰值反馈检测器（ＰＦＤ）．运用ＭｏｎｔｅＣａｒｌｏ模拟证明了ＲＦＤ和ＰＦＤ的优越性。

In this paper, the problems of near- far and multipleaccess interference in Code-Division Multiple-Access Detector(CDMA ) are analyzed , and for the case in which the signal energyis known, a new recursive feedback detector ( RFD ) is proposed ,which has less computationcomplexity . The RFD alleviates multipleaccess interference by detecting stronger user signals. Whenthe signal energy is not known, a peak- value feedback detector (PFD)is proposed , which has acertain capability of energy tracking.A performance comparison analysis for the two detectors iscarried out via Monte Carlo simulation .