DocumentCode :
2160792
Title :
Power allocation strategy for MIMO system based on beam-nulling
Author :
Gheryani, Mabruk ; Wu, Zhiyuan ; Shayan, Yousef R.
Author_Institution :
Dept. of Electr. Eng., Concordia Univ., Montreal, QC
fYear :
2009
fDate :
3-6 May 2009
Firstpage :
756
Lastpage :
761
Abstract :
In this paper, we propose a scheme called ldquobeam-nullingrdquo using the same feedback bandwidth as beamforming but with higher capacity. In the beam-nulling scheme, the eigenvector of the weakest subchannel is fed back and then signals are sent over a generated subspace orthogonal to the weakest subchannel. Hence, the scheme can achieve high capacity. The capacities of water-filling, equal power, beamforming and beam-nulling are compared through theoretical analysis and numerical results. It is shown that at medium signal-to-noise ratio, beam-nulling approaches the optimal waterfilling scheme. Additionally, the existing beamforming and new proposed beam-nulling can be extended if more than one eigenvector is available at the transmitter. The new extended schemes are called multi-dimensional (MD) beamforming and MD beam-nulling. Theoretical analysis and numerical results in terms of capacity are also provided to evaluate the new extended schemes.
Keywords :
MIMO communication; array signal processing; eigenvalues and eigenfunctions; radio transmitters; telecommunication channels; MIMO system; beam-nulling; eigenvector; feedback bandwidth; multidimensional beamforming; power allocation; signal-to-noise ratio; transmitter; water-filling; weakest subchannel; Array signal processing; Bandwidth; Channel capacity; Channel state information; Feedback; MIMO; Receiving antennas; Signal generators; Transmitters; Transmitting antennas;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Electrical and Computer Engineering, 2009. CCECE '09. Canadian Conference on
Conference_Location :
St. John´s, NL
ISSN :
0840-7789
Print_ISBN :
978-1-4244-3509-8
Electronic_ISBN :
0840-7789
Type :
conf
DOI :
10.1109/CCECE.2009.5090230
Filename :
5090230
Link To Document :
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