DocumentCode :
463812
Title :
Orthogonal Beamforming for SDMA Downlink with Limited Feedback
Author :
Huang, Kejie ; Andrews, Jeffrey G. ; Heath, Robert W.
Author_Institution :
Dept. of Electr. & Comput. Eng., Texas Univ., Austin, TX, USA
Volume :
3
fYear :
2007
fDate :
15-20 April 2007
Abstract :
On a multi-antenna downlink channel, separation of multiple users by transmit beamforming enables simultaneous transmission from the base station to the users, resulting in high sum throughput. This paper proposes and analyzes a practical algorithm for joint scheduling and orthogonal beamforming, which is enabled by feedback of quantized channel state information (CSI). In this approach, each user quantizes CSI using a codebook comprised of multiple orthonormal vector sets and sends back quantized CSI. Using feedback CSI, the base station jointly selects a set of orthogonal beamforming vectors and schedules a subset of feedback users for downlink transmission such that the throughput is maximized. For moderate to large numbers of users, the proposed algorithm achieves higher sum capacities than the conventional ones.
Keywords :
antenna arrays; feedback; space division multiple access; wireless channels; SDMA downlink; feedback CSI; joint scheduling; limited feedback; multi-antenna downlink channel; multiple orthonormal vector sets; orthogonal beamforming; quantized channel state information; transmit beamforming; Algorithm design and analysis; Array signal processing; Base stations; Channel state information; Downlink; Information analysis; Multiaccess communication; Scheduling algorithm; State feedback; Throughput; Array Signal Processing; Broadcast Channels; Multiuser Channels; Scheduling; Space Division Multiplexing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Acoustics, Speech and Signal Processing, 2007. ICASSP 2007. IEEE International Conference on
Conference_Location :
Honolulu, HI
ISSN :
1520-6149
Print_ISBN :
1-4244-0727-3
Type :
conf
DOI :
10.1109/ICASSP.2007.366481
Filename :
4217655
Link To Document :
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