Interference temperature: a metric for dynamic spectrum utilization
International Journal of Network Management
NeXt generation/dynamic spectrum access/cognitive radio wireless networks: a survey
Computer Networks: The International Journal of Computer and Telecommunications Networking
Multi-user diversity in a spectrum sharing system
IEEE Transactions on Wireless Communications
Multi-user diversity gain for oblivious and informed users in downlink channels
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
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
Achieving Multi-user Diversity Gain using User-Identity Feedback
IEEE Transactions on Wireless Communications
Opportunistic beamforming using dumb antennas
IEEE Transactions on Information Theory
On Capacity Under Receive and Spatial Spectrum-Sharing Constraints
IEEE Transactions on Information Theory
Spectrum pooling: an innovative strategy for the enhancement of spectrum efficiency
IEEE Communications Magazine
Approaches to spectrum sharing
IEEE Communications Magazine
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
Capacity limits of cognitive radio with distributed and dynamic spectral activity
IEEE Journal on Selected Areas in Communications
Performance of Cognitive Radios in Dynamic Fading Channels Under Primary Outage Constraint
Wireless Personal Communications: An International Journal
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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. Copyright © 2011 John Wiley & Sons, Ltd.