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
fDate :
2/1/2008 12:00:00 AM
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;
Journal_Title :
Wireless Communications, IEEE Transactions on
DOI :
10.1109/TWC.2008.060649