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    Relay selection in underlay cognitive networks with fixed transmission power nodes

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    Type
    Article
    Authors
    Hussain, Syed Imtiaz
    Abdallah, Mohamed M.
    Alouini, Mohamed-Slim cc
    Qaraqe, Khalid A.
    Hasna, Mazen Omar
    KAUST Department
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Communication Theory Lab
    Date
    2013-07-31
    Online Publication Date
    2013-07-31
    Print Publication Date
    2013-11
    Permanent link to this record
    http://hdl.handle.net/10754/562875
    
    Metadata
    Show full item record
    Abstract
    Underlay cognitive networks operate simultaneously with primary networks satisfying stringent interference constraints, which reduces their transmission power and coverage area. To reach remote destinations, secondary sources use relaying techniques. Selecting the best relay among the available ones is a well known technique. Recently, selective cooperation is investigated in cognitive networks where the secondary nodes can adapt their transmission power to always satisfy the interference threshold. In this paper, we investigate a situation where the secondary nodes have a fixed transmission power and may violate the interference threshold. We present two relay selection schemes; the first one excludes the relays not satisfying the interference constraint and then picks up a relay from the remaining ones that can provide the maximum signal-to-noise ratio (SNR). The other scheme uses a quotient of the relay link SNR and the interference from the relay to the primary user and optimizes it to maximise the relay link SNR. We derive closed form expressions for outage probability, bit error rate, channel capacity and diversity of the system for both schemes by using tight approximations. We also study mutual effects of interference. Simulation results confirm the analytical results and reveal that the relay selection is feasible at low SNRs. Copyright © 2013 John Wiley & Sons, Ltd.
    Citation
    Hussain, S. I., Abdallah, M. M., Alouini, M.-S., Qaraqe, K., & Hasna, M. (2013). Relay selection in underlay cognitive networks with fixed transmission power nodes. Transactions on Emerging Telecommunications Technologies, 24(7-8), 734–747. doi:10.1002/ett.2691
    Sponsors
    This publication was made possible by National Priority Research Program grant No. 5-250-2-087 from the Qatar National Research Fund (a member of Qatar Foundation). The statements made herein are solely the responsibility of the authors.
    Publisher
    Wiley
    Journal
    Transactions on Emerging Telecommunications Technologies
    DOI
    10.1002/ett.2691
    ae974a485f413a2113503eed53cd6c53
    10.1002/ett.2691
    Scopus Count
    Collections
    Articles; Electrical and Computer Engineering Program; Communication Theory Lab; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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