A Novel Precoding Design for MIMO Broadcast Channel

Huan SUN  Xiaohu YOU  

IEICE TRANSACTIONS on Communications   Vol.E91-B   No.4   pp.1223-1226
Publication Date: 2008/04/01
Online ISSN: 1745-1345
DOI: 10.1093/ietcom/e91-b.4.1223
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
orthogonal precoding,  multi-user scheduling,  

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The problem of joint orthogonal precoding and user scheduling in a multi-user multi-input multi-output (MU-MIMO) downlink system is considered. Based on the theoretics of subspace and vector projection, a novel orthogonal precoding matrix is designed to achieve high sum-rate capacity with low to moderate number of active users and in low SNR regions. With respect to sum-rate capacity, numerical simulations show that the proposed algorithm outperforms the zero-forcing beam-forming (ZFBF) and linear orthogonal beam-forming (OLBF).