An Efficient User Selection Algorithm for Zero-Forcing Beamforming in Downlink Multiuser MIMO Systems

Haibo ZHENG  Xiang CHEN  Shidong ZHOU  Jing WANG  Yongxing ZHOU  James Sungjin KIM  

IEICE TRANSACTIONS on Communications   Vol.E89-B    No.9    pp.2641-2645
Publication Date: 2006/09/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e89-b.9.2641
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.