Switch-and-examine relaying scheme for cognitive AF relay networks in rayleigh fading channels

Anas M. Salhab, Salam A. Zummo

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


This paper introduces cognitive amplify-and-forward (AF) relay networks employing the low complexity switch-andexamine diversity combining (SEC) relaying scheme. This scheme requires low amount of channel estimations compared to the opportunistic relaying and it is based on the SEC diversity combining technique in which a relay out of multiple relays is selected to forward the source message to destination. The selection process is performed such that the end-to-end (e2e) signal-to-noise ratio (SNR) of the selected relay satisfies a predetermined switching threshold. In addition, the paper derives approximate expressions for the outage probability and symbol error probability (SEP) of the proposed system. The channel capacity is also numerically calculated. Furthermore, the system is studied at high SNR values where the diversity order and coding gain are derived. Results show that the diversity order of the studied cognitive AF relaying with SEC selection is the same as its non-cognitive counterpart.

Original languageEnglish
Title of host publication2014 IEEE 80th Vehicular Technology Conference, VTC2014-Fall, Proceedings
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479944491, 9781479944491
StatePublished - 24 Nov 2014

Publication series

NameIEEE Vehicular Technology Conference
ISSN (Print)1550-2252

Bibliographical note

Publisher Copyright:
© 2014 IEEE.

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Applied Mathematics


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