Cooperative Precoding With Limited Feedback for MIMO Interference Channels
Multi-antenna pre-coding effectively mitigates the interference in wireless networks. However, the resultant performance gains can be significantly compromised in practice if the pre-coder design fails to account for the inaccuracy in the Channel State Information (CSI) feedback. This paper addresses this issue by considering finite-rate CSI feedback from receivers to their interfering transmitters in the two-user Multiple-Input-Multiple-Output (MIMO) interference channel, called cooperative feedback, and proposing a systematic method for designing transceivers comprising linear pre-coders and equalizers. Specifically, each pre-coder/equalizer is decomposed into inner and outer components for nulling the cross-link interference and achieving array gain, respectively.