A new downlink beamforming and power control scheme for wireless mobile communications

A new technique for downlink beamforming and power control in mobile communications is proposed. In the new algorithm, the transmitted power from the base station (BS) and the beamforming weights are obtained in two steps. First, the normalized downlink beamforming weights are obtained based on the estimation of the relative interfering strength so that the relative power of co-channel interference is minimized, and then the BS transmitted power is computed to minimize the total BS transmitted power. Simulation results show that the signal-to-noise-plus-interference ratio specifications at each mobile station are satisfied and that the proposed algorithm leads to a total BS transmitted power which is very close to that achieved with the optimum joint beamforming and power control algorithm. At the same time, the computational complexity of the proposed algorithm is significantly lower than that of the optimum joint beamforming and power control algorithm.