Joint Power Control Algorithm for CDMA TDD System

摘要

Current uplink power control algorithm of code division multiple access (CDMA) time division duplex(TDD) system contains signal-to-interference-ratio(SIR) and interference measurement, which is based on history information. However, the adjustment of transmission power of one user equipment(UE) will affect SIR of the others, because the power control is done independently of the power adjustment of other UE's. So the convergence speed of power control is not fast and the system performance degrades. In the proposed algorithm, all UE's assigned in same time slot adjust their transmission power based on current information, which takes into account the adjustments of transmission power of all UE's. The simulation results indicated that the proposed algorithm outperforms the old algorithm.