NDLI: Opportunistic Beamforming with Limited Feedback

Content Provider	IEEE Xplore Digital Library
Author	Sanayei, S. Nosratinia, A.
Copyright Year	2005
Description	Author affiliation: Dept. of Electr. Eng., Texas Univ., Dallas, TX (Sanayei, S.; Nosratinia, A.)
Abstract	Transmit-side channel state information (CSI) can improve the quality of communication over fading channels. One way this information can be exploited is via (opportunistic) multi-user diversity. Also, in a multi-antenna scenario, CSI allows the transmitter to propagate along the eigendirections of the channel, thus achieving beamforming gain or array gain. In the face of these possibilities, the question we raise is this: if we can have only limited (reliable) feedback for channel state information, what form should this information take, and how should it be used. In a previous work, we have shown that most of the gain of a single-antenna multi-user diversity system can be captured by feedback of only one bit. In this paper, we extend that system to a multi-antenna transmitter. We propose and analyze a compound strategy that uses one bit for multi-user diversity and any further information for beamforming. We show that this method not only enjoys good throughput, but also has desirable fairness properties. Simulations confirm our assertions
Starting Page	648
Ending Page	652
File Size	277249
Page Count	5
File Format	PDF
ISBN	1424401313
ISSN	10586393
DOI	10.1109/ACSSC.2005.1599830
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Array signal processing Feedback Base stations Channel state information Fading Transmitters Throughput Delay Transmitting antennas Programmable control
Content Type	Text
Resource Type	Article
Subject	Signal Processing Computer Networks and Communications

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