Serial acquisition of DS-CDMA signals in rayleigh fading channels using smart antennas

This study is conducted & submitted in Partial Fulfillment of the Requirements for the Master's Degree in the Department of Electrical Engineering at the College of Engineering King Saud University, Riyadh, Kingdom of Saudi Arabia, Jumada-I 1428H - May 2007GSince the received signal levels in mobile communications are unknown, a fixed threshold value or single antenna may result in a high false alaram rate or low deterction probability for PN code acquisition in spread spectrum systems. Therefore, this tesis prposes an adaptive PN code acquisition system that adopts smart antenna and cell-averaging constant false alaram rate (CA-CFAR) processor to achieve reliable PN code acquisition in the presence of fading and interference. The CA-CFAR processor and smart antenna are adopted to adjest the decision threshold according to environments and improve detection performance, respectively. The performance of the proposed system has been assessed theoritically by deriving closed form expressions for the probability of detection, probability of false alarm, and mean acquisition time. Simulation results have been also presented to verify the theoritical analysis