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Low-Feedback-Rate and Low-Complexity Downlink Multiuser MIMO Systems

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3 Author(s)
Hyoungjoo Lee ; Sch. of Electr. Eng. & Comput. Sci., Seoul Nat. Univ., Seoul, South Korea ; Illsoo Sohn ; Kwang Bok Lee

In this paper, we propose a practical downlink multiuser multiple-input-multiple-output (MU-MIMO) system. The proposed MU-MIMO system focuses on improving two limiting factors for practical implementations of MU-MIMO: 1) feedback rate and 2) computational complexity. First, users efficiently feed their channel-state information back with low feedback rate based on the proposed channel-quantization method. Second, the beamforming matrix at the base station is easily computed using singular value decomposition (SVD). Numerical results show that the proposed MU-MIMO system achieves a higher sum rate than conventional MU-MIMO systems, particularly at low feedback rate, while the computational complexity is kept reasonable.

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Vehicular Technology, IEEE Transactions on  (Volume:59 ,  Issue: 7 )