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An Efficient User Selection Algorithm for Zero-Forcing Beamforming in Downlink Multiuser MIMO Systems
James Sungjin KIM
IEICE TRANSACTIONS on Communications
Publication Date: 2006/09/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
user selection, zero-forcing beamforming, multiuser MIMO, null space updating,
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In this letter, we propose an efficient user selection algorithm aiming to select users with less spatially correlation and meet the user number limit of zero-forcing beamforming in downlink multiuser MIMO systems. This algorithm yields a considerable complexity reduction with only a small loss in performance and it only needs partial users' CSI feedback. Coupled with the algorithm, a null space updating method in O(K2) time and a modified proportional fair scheduling algorithm are also proposed.