Effects of macrodiversity and microdiversity on CDMA forward-link capacity

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

2 Scopus Citations
View graph of relations

Author(s)

Detail(s)

Original languageEnglish
Pages (from-to)748-757
Journal / PublicationIEICE Transactions on Communications
VolumeE85-B
Issue number4
Publication statusPublished - Apr 2002
Externally publishedYes

Abstract

Both macrodiversity and microdiversity can effectively overcome the harmful effect of fading. Much of previous work focused on their benefits to the reverse link in CDMA systems. However, their effects on the forward link are less well understood. In this paper, we analyze the CDMA forward-link capacity with macrodiversity and microdiversity. It is shown that macrodiversity causes forward-link capacity loss since the extra forward-link channels supported by the involved base stations enhance not only the received signal power, but also the total interference. Unfortunately the latter gains more whatever power allocation scheme is adopted. Based on the analysis of the cause of capacity loss, we further present a new transmission scheme, in which some joint control among the involved base stations is made to assure that the signals arrived at the desired mobile in phase and simultaneously. The simulation results show that in the new transmission scheme much higher capacity can be achieved with macrodiversity and the capacity increases rapidly with the number of involved base stations. A comparison of the forward-link capacity with microdiversity and macrodiversity indicates that both types of diversity can bring benefits to the forward-link capacity. However, with macrodiversity higher capacity can be obtained at the cost of complexity.

Research Area(s)

  • CDMA, Forward-link capacity, Macrodiversity, Microdiversity

Citation Format(s)

Effects of macrodiversity and microdiversity on CDMA forward-link capacity. / Dai, Lin; Zhou, Shi-Dong; Yao, Yan.

In: IEICE Transactions on Communications, Vol. E85-B, No. 4, 04.2002, p. 748-757.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review