Geometric programming for communication systems
Communications and Information Theory
Optimal selection of channel sensing order in cognitive radio
IEEE Transactions on Wireless Communications
Long term fair scheduling in a cognitive wireless network with spectrum underlay
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
Exclusive-Region Based Scheduling Algorithms for UWB WPAN
IEEE Transactions on Wireless Communications
Resource allocation for spectrum underlay in cognitive radio networks
IEEE Transactions on Wireless Communications - Part 2
Joint rate and power allocation for cognitive radios in dynamic spectrum access environment
IEEE Transactions on Wireless Communications - Part 2
Opportunistic beamforming using dumb antennas
IEEE Transactions on Information Theory
Optimal power control, scheduling, and routing in UWB networks
IEEE Journal on Selected Areas in Communications
HC-MAC: A Hardware-Constrained Cognitive MAC for Efficient Spectrum Management
IEEE Journal on Selected Areas in Communications
Outage analysis in presence of correlated interferers in a cognitive radio CDMA network
International Journal of Communication Networks and Distributed Systems
Computer Networks: The International Journal of Computer and Telecommunications Networking
Ergodic Sum Rate Maximization for Underlay Spectrum Sharing with Heterogeneous Traffic
Wireless Personal Communications: An International Journal
Proportional fair power allocation for secondary transmitters in the TV white space
Journal of Electrical and Computer Engineering
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In this paper we study fair rate scheduling in an ad hoc cognitive wireless network with spectrum underlay. Transmissions in the network are allowed provided their interference to the primary network is below a predefined threshold. An optimal scheduling problem is formulated with an objective to achieve proportional fairness (PF) of the long-term average transmission rates among different links. Implementing the optimum scheduling requires high complexity. Two practical scheduling schemes are then proposed. In the first scheme, transmission priorities of the links are determined by their potential contributions to an objective utility function, assuming there is no co-channel interference within the network. In the second scheme, transmission priorities are derived from both the objective function and interference to the primary network. We also consider using exclusive regions to limit interference among simultaneous transmissions in order to improve the system throughput. The scheduling schemes can be implemented distributively in the ad hoc cognitive wireless network with limited assistance from the primary network. Our results show that the proposed PF scheduling schemes can achieve high overall throughput and close-to-optimum fairness, and using exclusive regions can improve the system utility without compromising the fairness performance.