DocumentCode :
1067417
Title :
Coherent opportunistic beamforming with partial channel information in multiuser wireless systems
Author :
Ko, Jae-Yun ; Oh, Dong-Chan ; Lee, Yong-Hwan
Author_Institution :
Seoul Nat. Univ., Seoul
Volume :
7
Issue :
2
fYear :
2008
fDate :
2/1/2008 12:00:00 AM
Firstpage :
705
Lastpage :
713
Abstract :
In this paper, we propose a new beamforming scheme that can work with partial channel information. The proposed beamforming scheme can simultaneously achieve multiuser diversity (MUD) gain and beamforming gain by utilizing the beam weight information of the selected user in addition to the signal-to-noise ratio (SNR) information of all users. To fully exploit spatial multiplexing gain, we further consider the use of multiple beams. Multiple beams are generated in a sequential manner to reduce the interference among users, while virtually increasing the desired signal power. Finally, we analyze the performance of the proposed scheme and verify it by computer simulation. Although the proposed scheme is somewhat affected by the user mobility, numerical results show that the proposed scheme is quite effective in low mobility environments.
Keywords :
diversity reception; radio networks; beam weight information; coherent opportunistic beamforming; multiple beams; multiuser diversity gain; multiuser wireless systems; partial channel information; signal-to-noise ratio; spatial multiplexing gain; user mobility; Array signal processing; Broadcasting; Feedback; Fluctuations; H infinity control; MIMO; Multiuser detection; Power generation; Signal to noise ratio; Transmitters;
fLanguage :
English
Journal_Title :
Wireless Communications, IEEE Transactions on
Publisher :
ieee
ISSN :
1536-1276
Type :
jour
DOI :
10.1109/TWC.2008.060649
Filename :
4450839
Link To Document :
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