||In this thesis we present a comparison of the spectral efficiency of Spatial Division Multiple Access (SDMA) systems with conventional omni-directional and sectorized systems. Also, performance analysis of combined macrodiveristy and SDMA system is examined. Our analysis attempts to incorporate the effect of co-channel interference (CCI) for users sharing the same channel within a cell (intra-cell interference) as well as the CCI from other cells (inter-cell interference). To determine the outage probability we utilize exact results for combined Rayleigh and Log-normal shadowing in conjunction with a generic antenna pattern. The study is limited to the forward link only and the switched- beam approach. Results are provided for the outage probability and spectral efficiency for various reuse distances and blocking probabilities. These demonstrate that under most conditions, SDMA systems have higher spectral efficiency than conventional omni-directional or sectored systems. Nevertheless under certain conditions such as high blocking probabilities or large reuse distances, the spectral efficiency of SDMA systems is lower than conventional systems. For systems combining macrodiversity and SDMA, the simulation results show that in terms of outage probability they are approximately one and a half times less than pure SDMA systems.