Abstract
The downlink minimum bit error rate (MBER) transmit beamforming is directly designed based on the uplink MBER receive beamforming solution for time division duplex (TDD) space-division multiple-access (SDMA) induced multiple-input multiple-output (MIMO) systems, where the base station (BS) is equipped with multiple antennas to support multiple single-antenna mobile terminals (MTs). It is shown that the dual relationship between multiuser detection and multiuser transmission can be extended to the rank-deficient system where the number of users supported is more than the number of transmit antennas available at the BS, if the MBER design is adopted. The proposed MBER transmit beamforming scheme is capable of achieving better performance over the standard minimum mean square error transmit beamforming solution with the support of low-complexity and high power-efficient MTs, particularly for rank-deficient TDD-SDMA MIMO systems. The robustness of the proposed MBER transmit beamforming design to the downlink and uplink noise or channel mismatch is investigated using simulation.
Highlights
Motivated by the demand for increasing throughput in wireless communication, antenna array assisted spatial processing techniques [1,2,3,4,5,6,7] have been developed in order to further improve the achievable spectral efficiency
The downlink minimum bit error rate (MBER) transmit beamforming is directly designed based on the uplink MBER receive beamforming solution for time division duplex (TDD) space-division multiple-access (SDMA) induced multiple-input multiple-output (MIMO) systems, where the base station (BS) is equipped with multiple antennas to support multiple single-antenna mobile terminals (MTs)
The proposed MBER transmit beamforming scheme is capable of achieving better performance over the standard minimum mean square error transmit beamforming solution with the support of low-complexity and high power-efficient MTs, for rank-deficient TDD-SDMA MIMO systems
Summary
Motivated by the demand for increasing throughput in wireless communication, antenna array assisted spatial processing techniques [1,2,3,4,5,6,7] have been developed in order to further improve the achievable spectral efficiency. The base station (BS) has the capacity to implement sophisticated receive (Rx) beamforming schemes to separate multiple user signals transmitted by mobile terminals (MTs) This provides a practical means of realising multiuser detection (MUD) for space-division multiple-access (SDMA) induced multiple-input multiple-output (MIMO) systems. We can apply the results of [20] to implement the MBER Tx beamforming scheme directly based on the MBER Rx beamforming solution already available at the BS with no computational cost at all, even for rank-deficient systems where the number of antennas at the BS is less than the number of MTs supported. The robustness of the proposed scheme is investigated when the downlink and uplink noise powers or channels mismatch
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