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We consider a MIMO relay downlink system using precoding and limited feedback from two-hop channels. Since the conventional precoding matrices are directly obtained by treating the quantized channel state information (CSI) feedback as the real CSI, we propose an improved relay precoding strategy by taking the effect of channel quantization error into account. The proposed relaying technique is designed...
We consider a MIMO relay downlink system using beamforming techniques with quantized channel state information (CSI) feedback from two hop channels. With this scheme, each remote user feeds back its quantized CSI to the relay, and the relay sends the quantized beamforming vectors to the base station (BS). An upper bound on the rate loss due to feedback quantization is first characterized. Then, a...
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