Interference temperature: a metric for dynamic spectrum utilization
International Journal of Network Management
IEEE Transactions on Wireless Communications
Optimal power allocation for cognitive radio under primary users outage loss constraint
ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Fundamental limits of spectrum-sharing in fading environments
IEEE Transactions on Wireless Communications
On cognitive radio networks with opportunistic power control strategies in fading channels
IEEE Transactions on Wireless Communications
Optimum power control over fading channels
IEEE Transactions on Information Theory
On Capacity Under Receive and Spatial Spectrum-Sharing Constraints
IEEE Transactions on Information Theory
Cognitive radio: brain-empowered wireless communications
IEEE Journal on Selected Areas in Communications
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This paper considers a cognitive radio network where a secondary user shares the same narrow band with a primary user for transmission. Instead of adopting the conventional interference-power/interferecne-temperature constraint, this paper proposes a new type of constraint for the secondary user to protect the primary transmission, which limits the maximum outage probability of the primary transmission subject to the secondary user's interference to be below a prescribed target. Under this newly proposed constraint along with the average/peak transmit power constraint, the paper derives the optimal power allocation strategies over block-fading channels for the secondary user to achieve its outage capacity. It is shown by simulations that the derived power allocation strategies achieve substantial outage capacity gains for the secondary user over the conventional power control policies based upon the interferencetemperature constraint, given the same primary user's outage probability constraint.