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Robust Collaborative-Relay Beamforming
Department of Electrical and Electronic Engineering, University College London.
Department of Electrical and Electronic Engineering, University College London.
Information Systems Laboratory, Stanford University, US.
KTH, School of Electrical Engineering (EES), Signal Processing. KTH, School of Electrical Engineering (EES), Centres, ACCESS Linnaeus Centre.ORCID iD: 0000-0003-2298-6774
2009 (English)In: IEEE Transactions on Signal Processing, ISSN 1053-587X, E-ISSN 1941-0476, Vol. 57, no 8, 3130-3143 p.Article in journal (Refereed) Published
Abstract [en]

Relay communications is a promising technique to extend the range of wireless communications by forwarding the message from the sender to the intended destination. While fixed or variable-power relays have been previously investigated, this paper addresses the collaborative use of variable-phase variable-power amplify-and-forward (AF) relays for robust beamforming, with the aid of imperfect channel state information (CSI) at the sender. In particular, the maximization of the worst-case signal-to-noise ratio (SNR) at the destination terminal is studied under a bounded spherical region for the norm of the CSI error vector from the relays to the destination. Our main contribution is that we prove, under a condition on the quality of the estimated CSI, the robust-optimal collaborative-relay beamforming (CRBF) can be obtained by S-Procedure and rank relaxation techniques. In addition, a distributed algorithm is developed by examining the structure of the optimal CRBF solution. Results demonstrate a significant gain of CRBF over non-robust approaches.

Place, publisher, year, edition, pages
IEEE , 2009. Vol. 57, no 8, 3130-3143 p.
Keyword [en]
Collaborative beamforming, MIMO, relay, user cooperation diversity, optimal power allocation, wireless, networks, optimization, mimo, constraints, information, capacity, channel, protocols
National Category
Telecommunications Communication Systems
URN: urn:nbn:se:kth:diva-18616DOI: 10.1109/tsp.2009.2021456ISI: 000268106700022ScopusID: 2-s2.0-68249162098OAI: diva2:336663
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-11-29Bibliographically approved

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Ottersten, Björn
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