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Hybrid MU-MIMO Precoding Based on K-Means User Clustering

1
Department of Telecommunications, University POLITEHNICA of Bucharest, 1-3, Iuliu Maniu Blvd., 061071 Bucharest, Romania
2
InfoVista SAS, 23 Carnot Av., 91300 Massy, France
*
Author to whom correspondence should be addressed.
Algorithms 2019, 12(7), 146; https://doi.org/10.3390/a12070146
Received: 31 May 2019 / Revised: 15 July 2019 / Accepted: 19 July 2019 / Published: 23 July 2019
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Abstract

Multi-User (MU) Multiple-Input-Multiple-Output (MIMO) systems have been extensively investigated over the last few years from both theoretical and practical perspectives. The low complexity Linear Precoding (LP) schemes for MU-MIMO are already deployed in Long-Term Evolution (LTE) networks; however, they do not work well for users with strongly-correlated channels. Alternatives to those schemes, like Non-Linear Precoding (NLP), and hybrid precoding schemes were proposed in the standardization phase for the Third-Generation Partnership Project (3GPP) 5G New Radio (NR). NLP schemes have better performance, but their complexity is prohibitively high. Hybrid schemes, which combine LP schemes to serve users with separable channels and NLP schemes for users with strongly-correlated channels, can help reduce the computational burden, while limiting the performance degradation. Finding the optimum set of users that can be co-scheduled through LP schemes could require an exhaustive search and, thus, may not be affordable for practical systems. The purpose of this paper is to present a new semi-orthogonal user selection algorithm based on the statistical K-means clustering and to assess its performance in MU-MIMO systems employing hybrid precoding schemes. View Full-Text
Keywords: 5G NR (New Radio); Non-linear Precoding (NLP); hybrid precoding; Tomlinson–Harashima Precoding (THP); Regularized Zero Forcing (RZF); Block Diagonalization (BD); gaussian angular correlation; spatial compatibility; MU-MIMO; K-means clustering; user selection 5G NR (New Radio); Non-linear Precoding (NLP); hybrid precoding; Tomlinson–Harashima Precoding (THP); Regularized Zero Forcing (RZF); Block Diagonalization (BD); gaussian angular correlation; spatial compatibility; MU-MIMO; K-means clustering; user selection
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Trifan, R.-F.; Enescu, A.-A.; Paleologu, C. Hybrid MU-MIMO Precoding Based on K-Means User Clustering. Algorithms 2019, 12, 146.

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