Accelerated power control for CDMA systems with beamforming or multiuser detection

We present an accelerated power control algorithm applicable for CDMA based communications systems employing advanced receiver techniques such as beamforming or multiuser detection. The proposed algorithm interweaves a fixed point power control algorithm accelerated by utilizing Aitken´s Δ²-process (also known as Steffensen´s method) with MMSE beamforming or MMSE multiuser detection. The algorithm shows asymptotically quadratic convergence and is benchmarked against Newton´s method. We further evaluate a lower bound on the Lipshitz constant which can be used to ensure convergence of the proposed algorithm. Numerical results are given for a fully deployed sectorized UMTS network with MMSE multiuser detection. Beside its employment within CDMA based communication systems, the algorithm can also be used for the acceleration of computational intensive network simulations.