递推功率估值码分多址多用户检测器

RECURSIVE POWER-ESTIMATE MULTIUSER DETECTOR FOR SYNCHRONOUS CODE-DIVISION MULTIUSER-ACCESS CHANNEL

在码分多址（ＣＤＭＡ）通信的多用户检测器中，存在多址于扰和Ｎｅａｒ－Ｆａｒ问题．对国、内外新近提出的几种多用户检测器进行了性能分析和比较．在未知信号功率情况下，提出一种性能较优的检测器──递推估计检测器（ＲＥＤ）；通过ＭｏｒｔｅＣａｒｌｏ模拟证明了当Ｎｅａｒ－Ｆａｒ问题严重时，ＲＥＤ检测器的抗Ｎｅａｒ－Ｆａｒ性能优于这几种多用户检测器，但用户之间的功率相差不大时，ＲＥＤ检测器的抗多址干扰能力比去相关判决反馈检测器稍差．

In multiuser detectors of Code-Division Multiple-Access(CDMA)communication,there are multiple-access interference and Near-Far problem.In this paper, in the cases of known signal powers,a few multiuser detectors newly proposed are studied theoretically,and compared in performance.When the signal powers are unknown,authors Propose a new detector-Recursive Estimate Detector(RED).Through Morte Carlo simulations,it is proved that,when Near-Far problem is serious,RED is superior to these Multiuser Detectors,but when the signal Powers are close to each other,RED is worse than DDFED.In a practical communication system,we must make some compromise.