Precoding by using a finite-set codebook at transmitters is an effective approach to improve the performance of multiple-input multiple-output (MIMO) systems with reduced feedback overhead. K-Best sphere decoders are popular for high-throughput spatially-multiplexed MIMO signal detection at receivers. In this paper, we propose a precoding-matrix-index (PMI) selection criterion suitable for K-best MIMO detectors by minimizing the trace of the upper triangular matrix after QR decomposition (QRD). To further improve the system performance, fully-sorted QRD, per-layer sorted QRD and partially-sorted QRD are also proposed to be incorporated in the minimum-trace PMI selection criterion. Simulation results based on the MIMO codebooks of 3GPP-LTE/LTE-A systems show the improvements of the proposed scheme compared to the non-precoding MIMO schemes and the precoding schemes using the conventional PMI selection criterions.
|出版狀態||已出版 - 2012|
|事件||18th Asia-Pacific Conference on Communications: "Green and Smart Communications for IT Innovation", APCC 2012 - Jeju Island, Korea, Republic of|
持續時間: 15 10月 2012 → 17 10月 2012
|???event.eventtypes.event.conference???||18th Asia-Pacific Conference on Communications: "Green and Smart Communications for IT Innovation", APCC 2012|
|國家/地區||Korea, Republic of|
|期間||15/10/12 → 17/10/12|