Optimality of beamforming for a correlated MISO relay channel

Prathapasinghe Dharmawansa, Matthew R. McKay, Ranjan K. Mallik, Khaled Ben Letaief

Research output: Chapter in Book/Report/Conference proceedingConference contribution

4 Citations (Scopus)

Abstract

We analyze the optimality of beamforming in multiple-input single-output relay channels without a direct link between the source and the destination. Assuming that the source has access to the channel correlation information, and that the relay operates in amplify and forward mode with a long term power constraint, we first show that the optimal transmission strategy is to transmit along the eigen-vectors of the transmit correlation matrix. The optimality of beamforming is then studied via the power allocation problem at the source. In particular, we derive a necessary and sufficient condition under which beamforming achieves the capacity. Our results demonstrate that the finite relay gain decreases the range at which beamforming is optimal.

Original languageEnglish
Title of host publication2010 IEEE International Conference on Communications, ICC 2010
DOIs
Publication statusPublished - 13 Aug 2010
Event2010 IEEE International Conference on Communications, ICC 2010 - Cape Town, South Africa
Duration: 23 May 201027 May 2010

Publication series

NameIEEE International Conference on Communications
ISSN (Print)0536-1486

Other

Other2010 IEEE International Conference on Communications, ICC 2010
CountrySouth Africa
CityCape Town
Period23/5/1027/5/10

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ASJC Scopus subject areas

  • Computer Networks and Communications
  • Electrical and Electronic Engineering

Cite this

Dharmawansa, P., McKay, M. R., Mallik, R. K., & Letaief, K. B. (2010). Optimality of beamforming for a correlated MISO relay channel. In 2010 IEEE International Conference on Communications, ICC 2010 [5502422] (IEEE International Conference on Communications). https://doi.org/10.1109/ICC.2010.5502422