Correlated interference analysis in CDMA multi-antenna systems

CDMA sectorized distributed antenna system constitutes the logical extent of the soft handoff scheme where all the users communicate with all the antennas in the service region. It has been reported that, in the reverse link, such systems, in comparison to conventional single-antenna systems, have the potential to achieve a capacity increase which is equal to the number of antenna elements used. In order to achieve this gain, the interference picked up by different antenna elements must be uncorrelated. We present a spatial correlated interference analysis for the simplest non-trivial system which has 2 antenna elements and 2 users. The effects of system parameters and user and antenna element locations on the correlated interference are investigated. This work lays down a foundational framework that may yield a comprehensive understanding of the performance of CDMA multi-antenna systems