Coordinated transmitter-receiver beamforming for MIMO broadcast channels

In this paper, we proposed a new coordinated transmitter-receiver beamforming scheme for multiple-input multiple-output (MIMO) broadcast channel. Random beamforming (RBF) is employed at base station (transmitter) and receive combining technique is employed at user terminals. The proposed scheme requires a little feedback load per user and can achieve high sum rate even if the total number of users is not large. Simulation results show that to achieve a high sum rate capacity point large number of users is required for RBF scheme while that is not required for the proposed scheme. And differing from RBF, increasing the number of receive antennas has very significant impact on the sum rate capacity for the proposed scheme.