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Collaborative-relay beamforming with perfect CSI: Optimum and distributed implementation

Zheng, G; Wong, KK; Paulraj, A; Ottersten, B; (2009) Collaborative-relay beamforming with perfect CSI: Optimum and distributed implementation. IEEE Signal Processing Letters , 16 (4) pp. 257-260. 10.1109/LSP.2008.2010810.

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Abstract

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. © 2009 IEEE.

Type: Article
Title: Collaborative-relay beamforming with perfect CSI: Optimum and distributed implementation
DOI: 10.1109/LSP.2008.2010810
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Engineering Science
URI: http://discovery.ucl.ac.uk/id/eprint/55857
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