Capacity analysis in CDMA distributed antenna systems

被引：131

作者：

Dai, L ^{[1
]}

Zhou, SD ^{[1
]}

Yao, Y ^{[1
]}

机构：

[1] State Key Lab Microwave & Digital Commun, Dept Elect Engn, Beijing 100084, Peoples R China

来源：

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS | 2005年 / 4卷 / 06期

关键词：

CDMA; distributed antenna; forward-link capacity; macrodiversity; maximal ratio combining (MRC); reverse-link capacity;

D O I：

10.1109/TWC.2005.858011

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 [电气工程]; 0809 [电子科学与技术];

摘要：

In this letter, the effect of maximal ratio combining (MRC)-based macrodiversity on the reverse-link and forward-link capacity in code division multiple access (CDMA)-distributed antenna systems is analyzed. The concept of virtual cell is illustrated, and the analytical outage probability expressions are derived. The present investigation shows that on the reverse link, the interference can be suppressed greatly with macrodiversity, which leads to a significant increase in capacity. However, on the forward-link, it is proven that if simulcasting is used in CDMA-distributed antenna systems, the forward-link capacity cannot increase with macrodiversity whatever power allocation scheme is adopted. Based on the analysis of the cause of capacity loss, a new transmission scheme is further presented and the optimal power allocation scheme is derived. If is shown that, in this case, the forward-link capacity increases rapidly with the number of involved distributed antennas.

引用

页码：2613 / 2620

页数：8

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