Limited Feedback Precoding Scheme for Downlink Multiuser MIMO Systems

Haibo ZHENG  Yongle WU  Yunzhou LI  Shidong ZHOU  Jing WANG  

IEICE TRANSACTIONS on Communications   Vol.E90-B   No.3   pp.689-692
Publication Date: 2007/03/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e90-b.3.689
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
limited feedback,  multiuser MIMO,  grassmannian beamforming,  user selection,  

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In this letter, we propose a limited feedback precoding scheme based upon grassmannian beamforming and user selection for downlink multiuser MIMO systems. Conventional random beamforming scheme only enjoys significant performance gains with a large number of users, which limits its practical application. With proper codebook size the proposed scheme outperforms conventional random beamforming scheme when the number of users is small or moderate.