Investigation of a combined power control scheme for a time-division duplex CDMA system

Time-Division Duplex (TDD)-CDMA technique is now accepted as a candidate of 3/sup rd/ generation mobile communication system (IMT-2000). As for Code Division Multiple Access (CDMA) system, power control is essential to mitigate the "Near-Far" effect and improve the system performance. A TDD system requires a special power control scheme due to its link characteristics. In this paper we present a combined power control in TDD and also investigate its performance by computer simulations. The simulation results show that the proposed power control scheme can overcome the deficiency of open-loop power control and work well in a TDD-CDMA scenario.