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    End-to-end performance of cooperative relaying in spectrum-sharing systems with quality of service requirements

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    Type
    Article
    Authors
    Asghari, Vahid Reza
    Aissa, Sonia
    KAUST Department
    Physical Science and Engineering (PSE) Division
    Date
    2011-07
    Permanent link to this record
    http://hdl.handle.net/10754/561811
    
    Metadata
    Show full item record
    Abstract
    We propose adopting a cooperative relaying technique in spectrum-sharing cognitive radio (CR) systems to more effectively and efficiently utilize available transmission resources, such as power, rate, and bandwidth, while adhering to the quality of service (QoS) requirements of the licensed (primary) users of the shared spectrum band. In particular, we first consider that the cognitive (secondary) user's communication is assisted by an intermediate relay that implements the decode-and-forward (DF) technique onto the secondary user's relayed signal to help with communication between the corresponding source and the destination nodes. In this context, we obtain first-order statistics pertaining to the first- and second-hop transmission channels, and then, we investigate the end-to-end performance of the proposed spectrum-sharing cooperative relaying system under resource constraints defined to assure that the primary QoS is unaffected. Specifically, we investigate the overall average bit error rate (BER), ergodic capacity, and outage probability of the secondary's communication subject to appropriate constraints on the interference power at the primary receivers. We then consider a general scenario where a cluster of relays is available between the secondary source and destination nodes. In this case, making use of the partial relay selection method, we generalize our results for the single-relay scheme and obtain the end-to-end performance of the cooperative spectrum-sharing system with a cluster of L available relays. Finally, we examine our theoretical results through simulations and comparisons, illustrating the overall performance of the proposed spectrum-sharing cooperative system and quantify its advantages for different operating scenarios and conditions. © 2011 IEEE.
    Citation
    Asghari, V., & Aissa, S. (2011). End-to-End Performance of Cooperative Relaying in Spectrum-Sharing Systems With Quality of Service Requirements. IEEE Transactions on Vehicular Technology, 60(6), 2656–2668. doi:10.1109/tvt.2011.2136391
    Sponsors
    Manuscript received May 3, 2010; revised September 22, 2010 and January 25, 2011; accepted March 3, 2011. Date of publication April 5, 2011; date of current version July 18, 2011. This work was supported by a Discovery Grant from the Natural Sciences and Engineering Research Council (NSERC) of Canada under grant number RGPIN/222907. This paper was presented in part at the IEEE International Communications Conference, Cape Town, South Africa, May 23-27, 2010. The review of this paper was coordinated by Prof. B. Hamdaoui.
    Publisher
    Institute of Electrical and Electronics Engineers (IEEE)
    Journal
    IEEE Transactions on Vehicular Technology
    DOI
    10.1109/TVT.2011.2136391
    ae974a485f413a2113503eed53cd6c53
    10.1109/TVT.2011.2136391
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division

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