Second Best Codeword for MIMO Broadcast Channels with Limited Feedback

摘要

In this paper, we propose a simple design for a multi-user MIMO precoder using a Grassmannian codebook. The precoder design is applied to both sides of the wireless link under the assumption of limited feedback and the same codebook. The proposed scheme aims to correct the precoding vectors choice in order to avoid more than one user having the same vector, a situation which degrades system performance. Simulation results show that our approach provides greater system performance enhancement in both error probability and sum rate.