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

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

Original languageEnglish
Title of host publicationIEEE International Conference on Communications (ICC) 2011
Publisher or commissioning bodyInstitute of Electrical and Electronics Engineers (IEEE)
Pages1 - 5
Number of pages5
ISBN (Print)9781612842325, 9781612842318
StatePublished - 29 Jul 2011

Publication series

ISSN (Print)15503607


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.

Additional information

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. This material is posted here with permission of the IEEE. Such permission of the IEEE does not in any way imply IEEE endorsement of any of the University of Bristol's products or services. Internal or personal use of this material is permitted. However, permission to reprint/republish this material for advertising or promotional purposes or for creating new collective works for resale or redistribution must be obtained from the IEEE by writing to By choosing to view this document, you agree to all provisions of the copyright laws protecting it.

Research areas

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

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