Collaborative-Relay Beamforming with Perfect CSI: Optimum and Distributed Implementation
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
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.
Collaborative beamforming, distributed implementation, relay
IdentifiersURN: urn:nbn:se:kth:diva-49779DOI: 10.1109/LSP.2008.2010810ISI: 000208127300006ScopusID: 2-s2.0-84867430771OAI: oai:DiVA.org:kth-49779DiVA: diva2:460281
QC 201112012011-11-292011-11-292012-09-04Bibliographically approved