Power Control and Diversity Performance Analysis in CDMA Systems

摘要

In wireless communications systems, fading can degrade a system's performance. In this paper, the problem that will be observed is the increase of system's performance when the antenna diversity techniques combined with power control in CDMA communication system to overcome fading. This research simulates the performance of the system, which power control algorithm is fixed step algorithm and combination of diversity is selective diversity combining. The simulation results show that combined power control and antenna diversity gives more performance improvement than using power control only. In the cases where the user of Doppler frequency is greater than 1/10 of the power control rate value, performance improvement also occurred, but the BER curves of E(,/Io tend toward the direction of the channel fading characteristics.