Robust precoding design for MIMO Interfering Broadcast Channels with limited feedback

In multiusers MIMO Interfering Broadcast Channels with limited feedback, there are quantization errors of quantized channel direction information (CDI). The system sum-rate performance will certainly degrade due to designing precoder with mismatch channel state information. Using tools from random matrix theory, some statistical characteristics of quantization error for CDI are obtained, and a precoder design scheme is proposed by minimizing the expected mean square error (MMSE). The proposed scheme is robust to the channel uncertainties caused by quantization error. Simulation shows the scheme effectively enhanced the system sum-rate and improved the system reliability.