Future wireless communication systems require more and more antennas at the transceiver to improve the achievable rates. multi-user multiple-input multiple-output (mu-mimo) technique is regarded as a potential techniq...
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Future wireless communication systems require more and more antennas at the transceiver to improve the achievable rates. multi-user multiple-input multiple-output (mu-mimo) technique is regarded as a potential technique to serve large number of users simultaneously to further increase the achievable rates in mimo systems. If the number of antennas at the transceiver is large, the computational complexity of precoding becomes the bottleneck and a big challenge in mu-mimo system. In this paper, a simplified QR decomposition with latticereductionassistedmu-mimoprecodingscheme named S-QR-LR is proposed as a low-complexity mu-mimo transmission scheme. The simplified QR decomposition method is delicately designed and operated twice for the proposed precodingscheme not only to achieve good performance but also reduce the computational complexity significantly. The proposed S-QR-LR scheme first uses the simplified QR decomposition operation to balance the multi-user interference and the noise. Then, the proposed S-QR-LR precodingscheme utilizes the simplified QR decomposition method again with the assist of latticereduction to obtain the precoding gain to further improve the performance with low computational complexity. Analytical and simulation results show that the proposed S-QR-LR precodingscheme achieves best performance among the existing precodingschemes, but requires the lowest computational complexity.
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