Observer based sliding-mode power control for CDMA systems

In this paper, we propose a sliding-mode power control algorithm for CDMA cellular communication systems. The new power control algorithm is based on linear quadratic control with a state observer. As an objective function, the accumulated variance of power and sum of power consumption is to be minimized with limited maximum power constraints. To compensate for the unmodeled dynamic errors caused by some fading effects, the sliding-mode surface is decided by following the solution of estimated state equation. Through a simulation comparison with the DCPC algorithm, the suggested power control scheme reveals that the faster convergence rate to target SIR can be attained with less computational iteration.