Space time joint processing for time slotted CDMA uplink

Abstract

In CDMA cellular mobile radio systems, the transmission quality and the system performance is mainly determined by the interference both from intracell and intercell. Joint detection (JD) and smart antenna (SA) are effective techniques which can be used to combat these interference. For the uplink of a time slotted CDMA system, most of the intracell interference can be eliminated by using joint detection with coherent receiver antenna diversity. So, the intercell interference plays the most important role on the system performance. In this paper, space time joint processing schemes for time slotted CDMA uplink are investigated. First, JD algorithms with coherent receiver antenna diversity (CRAD) are given. Then, some algorithms for estimating the intercell interference covariance matrix are studied, and a novel partition algorithm is proposed. Simulation results show that these algorithms can lead to considerable performance enhancement.