A Linear Processing Scheme in Multiuser Downlink MIMO Broadcasting Channel with Fixed Relays

Jie XU  Ling QIU 

Publication
IEICE TRANSACTIONS on Communications  Vol.E92-B  No.2  pp.679-682
Publication Date: 2009/02/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
Keyword: 
multiuser downlink MIMO broadcasting channel,  fixed relays,  singular value decomposition zero-forcing beamforming (SVD-ZFBF),multiuser diversity,  low complexity, 

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Summary: 
In this letter, we propose a novel singular value decomposition zero-forcing beamforming (SVD-ZFBF) relaying scheme in the multiuser downlink MIMO broadcasting channel with fixed relays. Based on the processing scheme, we apply SUS [5] to select users at the relay station (RS) and develop a joint power allocation strategy at the base station (BS) and RS. By increasing the power at RS or selecting active users to obtain more multiuser diversity, SVD-ZFBF can approach an upper bound and outperform SVD-ZFDPC [1] with much lower complexity. Moreover, we show that the noise power ratio of RS to users significantly impacts the performance.