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    Capacity limits of spectrum-sharing systems over hyper-fading channels

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    Type
    Article
    Authors
    Ekin, Sabit
    Yilmaz, Ferkan
    Çelebi, Hasari Burak
    Qaraqe, Khalid A.
    Alouini, Mohamed-Slim cc
    Serpedin, Erchin
    KAUST Department
    Communication Theory Lab
    Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
    Electrical Engineering Program
    Physical Science and Engineering (PSE) Division
    Date
    2011-01-20
    Online Publication Date
    2011-01-20
    Print Publication Date
    2012-11
    Permanent link to this record
    http://hdl.handle.net/10754/561704
    
    Metadata
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    Abstract
    Cognitive radio (CR) with spectrum-sharing feature is a promising technique to address the spectrum under-utilization problem in dynamically changing environments. In this paper, the achievable capacity gain of spectrum-sharing systems over dynamic fading environments is studied. To perform a general analysis, a theoretical fading model called hyper-fading model that is suitable to the dynamic nature of CR channel is proposed. Closed-form expressions of probability density function (PDF) and cumulative density function (CDF) of the signal-to-noise ratio (SNR) for secondary users (SUs) in spectrum-sharing systems are derived. In addition, the capacity gains achievable with spectrum-sharing systems in high and low power regions are obtained. The effects of different fading figures, average fading powers, interference temperatures, peak powers of secondary transmitters, and numbers of SUs on the achievable capacity are investigated. The analytical and simulation results show that the fading figure of the channel between SUs and primary base-station (PBS), which describes the diversity of the channel, does not contribute significantly to the system performance gain. © 2011 John Wiley & Sons, Ltd.
    Citation
    Ekin, S., Yilmaz, F., Celebi, H., Qaraqe, K. A., Alouini, M.-S., & Serpedin, E. (2011). Capacity limits of spectrum-sharing systems over hyper-fading channels. Wireless Communications and Mobile Computing, 12(16), 1471–1480. doi:10.1002/wcm.1082
    Sponsors
    The authors wish to thank Dr Serhan Yarkan for his help during the preparation of revisions. This work is supported by Qatar National Research Fund (QNRF) grant through National Priority Research Program (NPRP) no. 08-152-2-043. QNRF is an initiative of Qatar Foundation.
    Publisher
    Wiley
    Journal
    Wireless Communications and Mobile Computing
    DOI
    10.1002/wcm.1082
    ae974a485f413a2113503eed53cd6c53
    10.1002/wcm.1082
    Scopus Count
    Collections
    Articles; Physical Science and Engineering (PSE) Division; Electrical and Computer Engineering Program; Communication Theory Lab; Computer, Electrical and Mathematical Science and Engineering (CEMSE) Division

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