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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
Publication
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 Keyword: user selection, zero-forcing beamforming, multiuser MIMO, null space updating,
Full Text: PDF(264.6KB)>>
Summary:
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.
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