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On the Capacity of Secondary Networks Over Opportunistic Spectrum Access in Rayleigh Fading Channels

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Abstract

In this paper the effect of the opportunistic spectrum access on the spectrum utilization is studied in terms of the secondary network capacity measured at the secondary receiver. A mathematical model is developed to represent the secondary network capacity in Rayleigh fading channel. An exact analytical solution for the capacity is derived for both sensing and accessing fading channels. A numerical evaluation of the channel capacity is presented for different channel sensing and accessing schemes. The effects of detection and accessing channel parameters on the capacity are investigated. The analytical results that are validated by substantial simulations showed how the utilization of the network can be increased significantly by the suggested opportunistic spectrum accessing technique. It was found that when having a good sensing system with a high secondary user signal to noise ratio, accessing the licensed band increases and drives the spectrum utilization to its maximum. In addition, this work shows how the capacity can be positively affected by three factors: the secondary accessing channel, the primary user interference and the desired quality of service (QoS) of primary user. The awareness of a proper sensing scheme can maximize the spectrum utilization without degrading the QoS of primary users.

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Authors and Affiliations

  1. Department of Electrical Engineering, College of Engineering, United Arab Emirates University (UAEU), P.O Box 15551, Al-Ain, UAE

    Mohammed Abdel-Hafez

  2. College of Information Technology, United Arab Emirates University (UAEU), P.O Box 15551, Al-Ain, UAE

    Khaled Shuaib

  3. Electrical Engineering Program, Petroleum Institute, Abu Dhabi, Abu-Dhabi, UAE

    Omkalthoum El-Bashir Hamed

Authors
  1. Mohammed Abdel-Hafez
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  2. Khaled Shuaib
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  3. Omkalthoum El-Bashir Hamed
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Correspondence to Mohammed Abdel-Hafez.

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Abdel-Hafez, M., Shuaib, K. & El-Bashir Hamed, O. On the Capacity of Secondary Networks Over Opportunistic Spectrum Access in Rayleigh Fading Channels. Wireless Pers Commun 78, 1981–1994 (2014). https://doi.org/10.1007/s11277-014-2057-8

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  • DOI: https://doi.org/10.1007/s11277-014-2057-8

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