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 ,其代价是复杂度大大提高 In code division multiple access (CDMA) systems, both macrodiversity and differential diversity can greatly improve reverse channel quality and increase reverse user capacity. However, for the forward channel, there is not much research on the forward capacity of macrodiversity and differential set. The paper establishes the analysis model to derive the forward user capacity under the same conditions using H-antenna micro-diversity and H-antenna macro-diversity respectively. The simulation results show that both methods can improve the forward capacity of the CDMA system, and the capacity increases with the number of participating diversity antennas. In contrast, macrodiversity improves the forward capacity more significantly, at the cost of greatly increased complexity