论文部分内容阅读
宏分集可以有效地克服大尺度衰落的影响 .对于CDMA反向信道而言 ,采用宏分集可以有效地改善信道质量并提高反向容量 .与此相比 ,有关宏分集对CDMA前向信道的影响的研究则并不多见 .本文深入分析了多天线宏分集下的CDMA系统前向容量并发现 ,在传统CDMA系统中 ,无论采用何种功率分配方案 ,宏分集都会导致前向容量损失 .在分析容量损失原因的基础上 ,我们进一步提出了一种新的发送分集方案 .在该方案下 ,前向容量不仅得到较大的提高 ,而且会随着参与宏分集的基站数目的增多进一步增大 .
Macrodiversity can effectively overcome the impact of large-scale fading.For CDMA reverse channel, using macrodiversity can effectively improve the channel quality and increase the reverse capacity.Compared with this, the impact of macrodiversity on the CDMA forward channel The research on the forward capacity of CDMA system under multi-antenna macrodiversity has been deeply analyzed and found that macrodiversity will lead to the loss of forward capacity in the conventional CDMA system, regardless of the power allocation scheme. Based on the analysis of the causes of capacity loss, we further propose a new transmission diversity scheme, in which the forward capacity is not only greatly increased, but also further increased as the number of base stations participating in macro-diversity increases .