NDLI: QoS Guarantees in AF Relay Networks with Multiple Source-Destination Pairs in the Presence of Imperfect CSI

Content Provider	IEEE Xplore Digital Library
Author	Yupeng Liu Petropulu, A.P.
Copyright Year	2002
Abstract	A relay network approach is proposed that allows multiple source-destination pairs to communicate simultaneously. The communication is enabled by a multi-antenna amplify-and-forward relay and is implemented in two slots; in the first slot, the sources transmit, and in the second slot, the relay forwards the received signals after processing them through a Zeroforcing Beamforming (ZFBF) matrix. The relay determines the ZFBF matrix so that the transmit power is minimized while the SINR of each destination meets a predefined constraint. Initially, the design is based on perfect channel state information (CSI). Imperfect CSI results in interference at the destinations. This effect can be controlled by increasing the number of relay antennas, or by optimally selecting the antennas to be used. Antenna selection schemes are proposed, which minimize the outage probability, or the destination interference. Also, an iterative scheme is proposed, whereby the amplitudes of the beamforming weights of all source-destination pairs are iteratively increased so that the worst case SINRs meet the requirements of the destinations. It is shown that this approach, coupled with antenna selection, greatly reduces the outage probability.
Starting Page	4225
Ending Page	4235
Page Count	11
File Size	528372
File Format	PDF
ISSN	15361276
Volume Number	12
Issue Number	9
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2013-09-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Relays Interference Signal to noise ratio Antennas Array signal processing Quality of service Convergence antenna selection Relay networks beamforming amplify-and-forward relays QoS imperfect CSI
Content Type	Text
Resource Type	Article
Subject	Applied Mathematics Electrical and Electronic Engineering Computer Science Applications

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