Reduced outage probability relay selection for underlay cognitive networks

Ahmed M. Elshaarany, Mohamed Abdallah, Mohamed M. Khairy, Khalid Qaraqe

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

4 Citations (Scopus)

Abstract

In underlay cognitive networks, the unlicensed (secondary) user is allowed to share the spectrum with the licensed (primary) user under the constraint that the interference at the primary user should be below a specific threshold. This constraint forces the cognitive network to apply power control techniques, which typically result in limited transmission power and hence limited coverage area. As a solution to reach the intended far destinations, relaying techniques can be used to improve the performance of underlay cognitive networks in terms of signal-to-noise ratio (SNR). Recently, single best relay selection schemes have been proposed that maintain a desired SNR for the cognitive network while satisfying the interference level at the primary network. However, these schemes suffer from high outage probability especially at low SNR, where the probability of finding a single relay that satisfies both constraints is reduced. Therefore, in this paper, we propose a multiple relay selection scheme, where at each channel realization, we allow for multiple relay selection in case the best relay, among those that satisfy the interference constraint, does not satisfy the desired SNR. In particular, we select the least number of relays whose sum of their individual SNR's achieves the desired level. This scheme leads to a reduced outage probability especially for low SNR. We derive a closed form expression for the cumulative density function (CDF) of the selected relay(s) SNR for a certain number of relays. Simulation results confirm the analytical results and show that the proposed relay(s) selection algorithm in an underlay cognitive environment improves the outage probability and symbol error rate (SER) in low SNR regions.

Original languageEnglish
Title of host publicationIWCMC 2014 - 10th International Wireless Communications and Mobile Computing Conference
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages429-434
Number of pages6
ISBN (Electronic)9781479909599
DOIs
Publication statusPublished - 22 Sep 2014
Event10th International Wireless Communications and Mobile Computing Conference, IWCMC 2014 - Nicosia, Cyprus
Duration: 4 Aug 20148 Aug 2014

Other

Other10th International Wireless Communications and Mobile Computing Conference, IWCMC 2014
CountryCyprus
CityNicosia
Period4/8/148/8/14

Fingerprint

Outages
Signal to noise ratio
Power transmission
Power control
Probability density function

Keywords

  • Performance Analysis
  • Relay Selection
  • Underlay Cognitive radio

ASJC Scopus subject areas

  • Computer Science Applications
  • Electrical and Electronic Engineering
  • Computer Networks and Communications

Cite this

Elshaarany, A. M., Abdallah, M., Khairy, M. M., & Qaraqe, K. (2014). Reduced outage probability relay selection for underlay cognitive networks. In IWCMC 2014 - 10th International Wireless Communications and Mobile Computing Conference (pp. 429-434). [6906395] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/IWCMC.2014.6906395

Reduced outage probability relay selection for underlay cognitive networks. / Elshaarany, Ahmed M.; Abdallah, Mohamed; Khairy, Mohamed M.; Qaraqe, Khalid.

IWCMC 2014 - 10th International Wireless Communications and Mobile Computing Conference. Institute of Electrical and Electronics Engineers Inc., 2014. p. 429-434 6906395.

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

Elshaarany, AM, Abdallah, M, Khairy, MM & Qaraqe, K 2014, Reduced outage probability relay selection for underlay cognitive networks. in IWCMC 2014 - 10th International Wireless Communications and Mobile Computing Conference., 6906395, Institute of Electrical and Electronics Engineers Inc., pp. 429-434, 10th International Wireless Communications and Mobile Computing Conference, IWCMC 2014, Nicosia, Cyprus, 4/8/14. https://doi.org/10.1109/IWCMC.2014.6906395
Elshaarany AM, Abdallah M, Khairy MM, Qaraqe K. Reduced outage probability relay selection for underlay cognitive networks. In IWCMC 2014 - 10th International Wireless Communications and Mobile Computing Conference. Institute of Electrical and Electronics Engineers Inc. 2014. p. 429-434. 6906395 https://doi.org/10.1109/IWCMC.2014.6906395
Elshaarany, Ahmed M. ; Abdallah, Mohamed ; Khairy, Mohamed M. ; Qaraqe, Khalid. / Reduced outage probability relay selection for underlay cognitive networks. IWCMC 2014 - 10th International Wireless Communications and Mobile Computing Conference. Institute of Electrical and Electronics Engineers Inc., 2014. pp. 429-434
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