微分集和宏分集下的CDMA系统前向容量  

CDMA forward link capacity with microdiversity and macrodiversity

作　　者：代琳[1] 周世东[1] 姚彦[1] 

机构地区：[1]清华大学电子工程系

出　　处：《清华大学学报（自然科学版）》2002年第7期913-916,共4页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目 (6983 10 3 0 )

摘　　要：在码分多址 (CDMA)系统中 ,宏分集和微分集均可大大改善反向信道质量并增加反向用户容量。但对于前向信道而言 ,有关宏分集和微分集下前向容量的研究则并不多见。该文建立分析模型分别推导了相同条件下采用 H天线微分集和 H天线宏分集后的前向用户容量。仿真结果表明 :两种方式均可提高 CDMA系统前向容量 ,且容量随参与分集天线数的增多而增加。相比之下 ,宏分集对于前向容量的改善更为显著 。Both microdiversity and macrodiversity can effectively overcome the harmful effects of fading in CDMA systems. Most previous work has focused on their effects on the reverse link in CDMA systems; however, their effects on the forward link are less well understood. This paper presents an analytical model for the CDMA forward link capacity with H port macrodiversity and H port microdiversity. The numerical results show that both diversity types improve the forward link capacity. However, macrodiversity provides higher capacity obtained at the cost of more complexity.

关 键 词：CDMA系统 码分多址 微分集 宏分集 前向容量 信道衰落 

分 类 号：TN914.53[电子电信—通信与信息系统]