Robust adaptive power control for CDMA communication systems and its simulation

Abstract

Power control is an important research topic for code-division multiple access (CDMA) communication systems. Proper power control can increase system capacity and, especially, overcome the near-far problem effectively. Therefore, many researchers have done great works on this topic and got a lot of achievements during last decade. Adaptive control based on Least Square Algorithm is one of the commonest methods to control systems with uncertainties by estimating unknown system's parameters. However, applying the adaptive control algorithm to wireless communication systems is still a fresh topic and most of those works assumed that the wireless communication channel could be modeled by a linear system with a Gaussian white noise, which would lead to control error in the real channel environments. This paper presents a robust adaptive power control algorithm based on Extended Matrix Least Square for CDMA systems with colored noise. The simulation results show that the proposed algorithm has good performance and is more effective than the fixed-step algorithm.