This paper investigates an enhanced beamforming scheme for MIMO downlink transmission. The proposed scheme combines transmit beamforming with space-time block code (STBC), which has the advantages of both techniques. The scheme uses dual antenna array groups to achieve stable performance and utilizes the uplink direction of arrival (DOA) to perform transmit beamforming. Do the simulation to compare performance of the proposed scheme with the traditional beamforming approach. It is shown that the enhanced scheme provides better BER performance than the traditional beamforming techniques under the same simulation environment.

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