Feedback Bandwidth Allocation for Users under Different Types of Channels in Multi-Antenna Systems

Lv DING  Wei XU  Bin JIANG  Xiqi GAO  

Publication
IEICE TRANSACTIONS on Communications   Vol.E93-B   No.7   pp.1980-1983
Publication Date: 2010/07/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E93.B.1980
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Terrestrial Radio Communications
Keyword: 
multiple-input multiple-output,  zero-forcing beamforming,  broadcast channel,  limited feedback,  

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Summary: 
This paper considers an optimized limited feedback design for a multi-antenna system serving multiple users under different types of channels: Rayleigh distributed and line-of-sight distributed channels. Since the users are asymmetric, we propose an optimized feedback bandwidth allocation scheme for users under a total feedback rate constraint. The allocation scheme is designed according to the long-term channel type information of users, and thus it can be efficiently implemented. Numerical results verify the effectiveness of our proposed scheme.