Multi-user MIMO broadcast systems with imperfect feedbacks

In this paper, we investigate the impact of imperfect feedback on the multi-user multi-input multi-output (MU-MIMO) broadcast systems. We consider the MU-MIMO system with either zero-forcing (ZF)-based transmit beamforming or receive beamforming. By analysis and simulations, we find that if the effects of feedback channel variations are taken into account, the receive ZF MIMO broadcast system can have higher sum rate than the transmit ZF MIMO broadcast system. The transmit ZF scheduler outperforms the receive ZF scheduler at the cost of feedback bandwidth and perfect channel state information.

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