NDLI: A User Selection Algorithm Using Angle between Subspaces for Downlink MU-MIMO Systems

Content Provider	IEEE Xplore Digital Library
Author	Seongho Nam Jeongchan Kim Youngnam Han
Copyright Year	1972
Abstract	One of major issues in the efficient use of radio resource for multiuser multiple-input/multiple-output (MU-MIMO) systems is the selection of users to achieve the maximum system throughput. The optimal user selection algorithm, which requires exhaustive search, is prohibitive due to its high computational complexity where Block diagonalization (BD) method is applied and known as a suboptimal precoding technique for downlink MU-MIMO systems, which intents to perfectly eliminate inter-user interference. In this paper, we propose efficient, iterative user selection algorithms with low complexity, where the product of eigenvalues of effective channels is utilized as a selection metric by applying the concept of principal angles between subspaces. And, we further examined the applicability of the proposed algorithms to limited feedback systems and proportional fair (PF) scheduling. Through computational complexity analysis, we show that the proposed algorithm has low complexity with a little loss in throughput. Simulation results validate that the proposed algorithm achieves almost the same system throughput by a capacity-based algorithm under high SNR regime with considerable reduction in complexity.
Starting Page	616
Ending Page	624
Page Count	9
File Size	421024
File Format	PDF
ISSN	00906778
Volume Number	62
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-01-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Complexity theory Measurement Eigenvalues and eigenfunctions Algorithm design and analysis Scheduling Matrix decomposition Vectors limited feedabck Multiuser multiple input multiple output (MU-MIMO) user selection principal angle proportional fairness (PF)
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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