NDLI: On the optimality of multiantenna broadcast scheduling using zero-forcing beamforming

Content Provider	IEEE Xplore Digital Library
Author	Taesang Yoo Goldsmith, A.
Copyright Year	1983
Abstract	Although the capacity of multiple-input/multiple-output (MIMO) broadcast channels (BCs) can be achieved by dirty paper coding (DPC), it is difficult to implement in practical systems. This paper investigates if, for a large number of users, simpler schemes can achieve the same performance. Specifically, we show that a zero-forcing beamforming (ZFBF) strategy, while generally suboptimal, can achieve the same asymptotic sum capacity as that of DPC, as the number of users goes to infinity. In proving this asymptotic result, we provide an algorithm for determining which users should be active under ZFBF. These users are semiorthogonal to one another and can be grouped for simultaneous transmission to enhance the throughput of scheduling algorithms. Based on the user grouping, we propose and compare two fair scheduling schemes in round-robin ZFBF and proportional-fair ZFBF. We provide numerical results to confirm the optimality of ZFBF and to compare the performance of ZFBF and proposed fair scheduling schemes with that of various MIMO BC strategies.
Starting Page	528
Ending Page	541
Page Count	14
File Size	676260
File Format	PDF
ISSN	07338716
Volume Number	24
Issue Number	3
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2006-03-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Broadcasting Array signal processing Base stations MIMO Receiving antennas Throughput Transmitting antennas H infinity control Downlink Time division multiple access zero-forcing beamforming (ZFBF) Broadcast channel dirty paper coding (DPC) downlink scheduling fair scheduling imperfect channel state information (CSI) multiple-input/multiple-output (MIMO) multiple-input/multiple-output capacity multiuser diversity proportional fair
Content Type	Text
Resource Type	Article
Subject	Computer Networks and Communications Electrical and Electronic Engineering

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