A low information feedback beamforming scheme in distributed MIMO downlink systems

In distributed MIMO systems, by using multiple antennas mounted at different base stations, the capacity and performance of the system could be improved through spatial division multiplexing. However, in the closed loop transmission process, the base stations have to feedback decoding matrixes to the mobile stations, then consume resources of the system. In this paper, based on channel matrixes, an oblique projected method is proposed. The proposed method could decrease the quantity of information which has to feedback to mobile stations from base stations, and effectively suppresses interference from other mobile stations. Compared to zeroforcing method, the proposed method could effectively improve bit error rate performance and capacity of the system. Simulations prove the effectiveness of the proposed method.