Abstract
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.
| Original language | English |
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| Pages | 933-938 |
| Number of pages | 6 |
| DOIs | |
| State | Published - 2012 |
| Event | 18th Asia-Pacific Conference on Communications: "Green and Smart Communications for IT Innovation", APCC 2012 - Jeju Island, Korea, Republic of Duration: 15 Oct 2012 → 17 Oct 2012 |
Conference
| Conference | 18th Asia-Pacific Conference on Communications: "Green and Smart Communications for IT Innovation", APCC 2012 |
|---|---|
| Country/Territory | Korea, Republic of |
| City | Jeju Island |
| Period | 15/10/12 → 17/10/12 |
Keywords
- 3GPP-LTE
- finite feedback
- K-Best sphere decoder
- LTE-Advanced
- multiple-input multiple-output
- precoder
- sorted QR decomposition
- spatial-multiplexing