Per-subcarrier antenna selection for OFDMA-based cognitive radio systems

MZ Bocus, JP Coon, CN Canagarajah, JP McGeehan, A Doufexi, SMD Armour

Research output: Chapter in Book/Report/Conference proceedingConference Contribution (Conference Proceeding)

3 Citations (Scopus)
489 Downloads (Pure)

Abstract

The performance of an OFDM system can be improved by performing per-subcarrier antenna selection, which facilitates the exploitation of frequency and spatial diversity in the wireless channel. In this paper, we extend the concept of per-subcarrier antenna selection to a multiuser cognitive radio environment and present a practical subcarrier and antenna selection algorithm that exploits the multiuser, frequency and spatial diversities inherent in such systems while requiring only limited channel knowledge. The problem is formulated as an integer programming (IP) problem. We demonstrate that a linear relaxation of the problem still leads to an optimal solution, thus reducing the computational complexity relative to other approaches found in the literature. Simulation results demonstrate that the proposed resource allocation problem leads to an improvement in secondary users' link qualities, compared to a single-input single-output system and, at the same time, limits the interference to the primary user.
Translated title of the contributionPer-subcarrier atenna selection for OFDMA-based cognitive radio systems
Original languageEnglish
Title of host publicationIEEE International Conference on Communications (ICC) 2011
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages1 - 5
Number of pages5
ISBN (Print)9781612842325, 9781612842318
DOIs
Publication statusPublished - 29 Jul 2011

Publication series

Name
ISSN (Print)15503607

Bibliographical note

Rose publication type: Conference contribution

Additional information: With accompanying conference presentation.

Sponsorship: The authors would like to thank the directors at TRL and the Centre for Communications Research, Bristol, for their continued support.

Terms of use: Copyright © 2011 IEEE. Reprinted with permission from MZ Bocus, J Coon, CN Canagarajah, A Doufexi, SMD Armour; paper - Per-subcarrier antenna selection for OFDMA-based cognitive radio systems ; IEEE International Conference on
Communications (ICC) 2011; June 2011.

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Keywords

  • per-subcarrier antenna selection
  • spatial diversity
  • cognitive radio
  • OFDM

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