| This thesis studies the principles and applications of antenna arrays in code division multiple-access (CDMA) and wireless communications. Reverse link performance of CDMA systems with antenna arrays is analyzed and closed-form expressions far user capacity, bit-error rates (BER), and outage probabilities are derived. When beamforming is implemented, the impact of the impairments, such as direction of arrival (DOA) estimation errors, spatial spreads, array perturbation, and mutual coupling on the system performance is also investigated. When diversity gain is achieved through antenna arrays, we investigate the performance degradation due to fading correlations. A comparison between linear constrained minimum variance (LCMV) and minimum variance distortionless response (MVDR) beamforming in terms of signal-to-interference-plus-noise ratio (SINR) is also examined. SINR degradation as a result of the increase of constraints in zero-forcing LCMV beamforming is investigated and an SINR expression is also derived for an optimal LCMV beamforming algorithm. For narrowband wireless systems in correlated Rayleigh and Nakagami fading channels, closed-form expressions of probability density function (PDF) of signal-to-interference-plus-noise (SINR) and outage probabilities are derived. The performance of both CDMA and narrowband wireless systems with linear, circular, and rectangular arrays is also examined and their capability to suppress the spatial spread and mutual coupling is investigated. |
