A new method for centralised and decentralised robust power control in CDMA systems

In this paper, we propose a new approach based on optimal control systems theory which allows the derivation of power control methods, both in a centralised and decentralised framework. More specifically, we propose to use a linear quadratic Gaussian controller which, in the case of CDMA systems, ensures that the signal-to-interference ratio is close to a target value. The proposed method is shown to be robust to system imperfections such as imperfect call admission control, errors on the feedback control channel and we also show that it performs well for high mobile speeds.