微分集和宏分集下的CDMA系统前向容量

CDMA forward link capacity with microdiversity and macrodiversity

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.