Forward Link Performance of Site Selection Diversity Transmit with Antenna Diversity and Rake Combining in DS-CDMA Mobile Radio

Abstract In this paper, it is theoretically shown that the optimal solution to maximize the DS-CDMA forward link capacity under the condition of constant total transmit power is to transmit only from the best base station (BS) that has the maximum channel gain (this is called site selection diversity transmit (SSDT)). This theoretical analysis is confirmed by the Monte-Carlo computer simulation of an instantaneous SSDT which is based on instantaneous channel gain. In addition we also consider the case of average power based SSDT to study the difference of these two types of SSDT and their effects on forward link capacity.