Low-Complexity Transmit Beamforming for MIMO Systems

This paper proposes a simple downlink transmit beamforming scheme for multiple-input multiple-output systems with low complexity. The authors first introduce the beamforming system where the Base Station (BS) utilizes only a fraction of the full channel response. The Mobile Station (MS) of the proposed system selects a single antenna at the receive side based on which the BS adjusts beamforming weights without any overhead to the structure of the BS. Without requiring the singular value decomposition operation, the proposed scheme achieves a performance very close to that of the optimum beamforming system.