Interference temperature: a metric for dynamic spectrum utilization
International Journal of Network Management
Multi-user diversity in a spectrum sharing system
IEEE Transactions on Wireless Communications
A new simple model for land mobile satellite channels: first- and second-order statistics
IEEE Transactions on Wireless Communications
Fundamental limits of spectrum-sharing in fading environments
IEEE Transactions on Wireless Communications
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
Performance Analysis of Cognitive Radio Multiple-Access Channels Over Dynamic Fading Environments
Wireless Personal Communications: An International Journal
Impact of Quality of Service Constraints on the Performance of Spectrum Sharing Cognitive Users
Wireless Personal Communications: An International Journal
Scheduling in a Spectrum-Sharing Cognitive Environment Under Outage Probability Constraint
Wireless Personal Communications: An International Journal
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Cognitive radio with spectrum sharing feature is a promising technique to address the spectrum under-utilization problem in dynamically changing environments. In this paper, achievable capacity gain of spectrum sharing systems over dynamic fading environments is studied. For the analysis, a theoretical fading model called hyper fading model that is suitable to the dynamic nature of cognitive radio channel is proposed. Closed-form expression of probability density function (PDF) and cumulative density function (CDF) of the signal-to-noise ratio (SNR) for secondary users in spectrum sharing systems are derived. In addition, the capacity gains achievable with spectrum sharing systems in high and low power regions are obtained. Numerical simulations are performed to study the effects of different fading figures, average powers, interference temperature, and number of secondary users on the achievable capacity.