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A Linear Processing Scheme in Multiuser Downlink MIMO Broadcasting Channel with Fixed Relays
Jie XU Ling QIU
IEICE TRANSACTIONS on Communications
Publication Date: 2009/02/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Wireless Communication Technologies
multiuser downlink MIMO broadcasting channel, fixed relays, singular value decomposition zero-forcing beamforming (SVD-ZFBF),multiuser diversity, low complexity,
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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  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  with much lower complexity. Moreover, we show that the noise power ratio of RS to users significantly impacts the performance.