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Feedback Bandwidth Allocation for Users under Different Types of Channels in Multi-Antenna Systems
Lv DING Wei XU Bin JIANG Xiqi GAO
IEICE TRANSACTIONS on Communications
Publication Date: 2010/07/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Terrestrial Radio Communications
multiple-input multiple-output, zero-forcing beamforming, broadcast channel, limited feedback,
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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.