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

Sabit Ekin, Ferkan Yilmaz, Hasari Burak Çelebi, Khalid A. Qaraqe, Mohamed-Slim Alouini, Erchin Serpedin

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


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.
Original languageEnglish (US)
Pages (from-to)1471-1480
Number of pages10
JournalWireless Communications and Mobile Computing
Issue number16
StatePublished - Jan 20 2011

ASJC Scopus subject areas

  • Computer Networks and Communications
  • Information Systems
  • Electrical and Electronic Engineering


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