Evaluation of PMI Feedback Schemes for MU-MIMO Pairing

The status of codebook based MU MIMO feedback schemes in different wireless standards are briefly overviewed. Based on the Normal Feedback Scheme to feedback the preferred Precoding Matrix Index (PMI), a Best Companion Pairing (BCP) scheme and a Best Companion Cluster (BCC) scheme are introduced to make more efficient pairing. Besides the preferred PMI, UE need to feedback more PMIs for the BCP scheme or a cluster index for the BCC scheme to minimize the intracell or intercell interference. System level simulation results show that the BCC scheme can make a reasonable tradeoff between feedback overhead and throughput.

[1]  Chau Yuen,et al.  Limited feedback for multi-antenna multi-user communications with Generalized Multi-Unitary Decomposition , 2008, 2008 IEEE 19th International Symposium on Personal, Indoor and Mobile Radio Communications.

[2]  J. Cioffi,et al.  Achievable rates for Tomlinson-Harashima precoding , 1995, Proceedings of 1995 IEEE International Symposium on Information Theory.

[3]  Ari Hottinen,et al.  Optimal user pairing in downlink MU-MIMO with transmit precoding , 2008, WiOpt 2008.

[4]  Chau Yuen,et al.  Achieving near-capacity at low SNR on a multiple-antenna multiple-user channel , 2009, IEEE Transactions on Communications.

[5]  Cheng Wang,et al.  Adaptive downlink multi-user MIMO wireless systems for correlated channels with imperfect CSI , 2006, IEEE Transactions on Wireless Communications.

[6]  Max H. M. Costa,et al.  Writing on dirty paper , 1983, IEEE Trans. Inf. Theory.