Downlink transmit beamforming is a promising technique to reduce interference, and power control is a technique to adjust transmission power to satisfy the link quality. Joint transmission power control and beamforming are proposed to minimize total transmission power. The joint optimization problem is solved by receiver beamforming and power control in virtual uplink. SIR based power control is performed to adjust the power allocation, and transmit beamforming weight vectors are determined by minimum variance distortionless response criterion. The multipath combining weight vectors are determined by maximum ration combining criterion. Simulation results show the joint optimization scheme decreases the transmission power, and system performance is enhanced.
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