Capacity limits of spectrum-sharing systems over hyper-fading channels
Type
ArticleAuthors
Ekin, SabitYilmaz, Ferkan
Çelebi, Hasari Burak
Qaraqe, Khalid A.
Alouini, Mohamed-Slim

Serpedin, Erchin
KAUST Department
Communication Theory LabComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program
Physical Science and Engineering (PSE) Division
Date
2011-01-20Online Publication Date
2011-01-20Print Publication Date
2012-11Permanent link to this record
http://hdl.handle.net/10754/561704
Metadata
Show full item recordAbstract
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.1082Sponsors
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
WileyDOI
10.1002/wcm.1082ae974a485f413a2113503eed53cd6c53
10.1002/wcm.1082