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Collaborative-Relay Beamforming with Perfect CSI: Optimum and Distributed Implementation
Department of Electrical and Electronic Engineering, University College London, UK.
Department of Electrical and Electronic Engineering, University College London, UK.
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 Signal Processing Letters, ISSN 1070-9908, E-ISSN 1558-2361, Vol. 16, no 4, 257-260 p.Article in journal (Refereed) Published
Abstract [en]

This letter studies the collaborative use of amplify-and-forward (AF) relays to form a virtual multiple-input single-output (MISO) beamforming system with the aid of perfect channel state information (CSI) in a flat-fading channel. In particular, we optimize the relay weights jointly to maximize the received signal-to-noise ratio (SNR) at the destination terminal with both individual and total power constraints at the relays. We show that the optimal collaborative-relay beamforming (CRB) solution achieves the full diversity of a MISO antenna system. Another main contribution of this letter is a distributed algorithm that allows each individual relay to learn its own weight, based on the Karush-Kuhn-Tucker (KKT) analysis.

Place, publisher, year, edition, pages
IEEE , 2009. Vol. 16, no 4, 257-260 p.
Keyword [en]
Collaborative beamforming, distributed implementation, relay
National Category
Communication Systems
Identifiers
URN: urn:nbn:se:kth:diva-49779DOI: 10.1109/LSP.2008.2010810ISI: 000208127300006Scopus ID: 2-s2.0-84867430771OAI: oai:DiVA.org:kth-49779DiVA: diva2:460281
Note

QC 20111201

Available from: 2011-11-29 Created: 2011-11-29 Last updated: 2017-12-08Bibliographically approved

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Ottersten, Björn

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