Adventures in stochastic processes
Adventures in stochastic processes
Distributed spectrum sensing and access in cognitive radio networks with energy constraint
IEEE Transactions on Signal Processing
IEEE Transactions on Wireless Communications
Opportunistic spectrum access for energy-constrained cognitive radios
IEEE Transactions on Wireless Communications
Power efficiency maximization in cognitive radio networks
WCNC'09 Proceedings of the 2009 IEEE conference on Wireless Communications & Networking Conference
Opportunistic Spectrum Access via Periodic Channel Sensing
IEEE Transactions on Signal Processing
On cognitive radio networks with opportunistic power control strategies in fading channels
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
Decentralized cognitive MAC for opportunistic spectrum access in ad hoc networks: A POMDP framework
IEEE Journal on Selected Areas in Communications
Cognitive Medium Access: Constraining Interference Based on Experimental Models
IEEE Journal on Selected Areas in Communications
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Under interference constraint and energy consumption constraint, tomaximize the channel utilization, an opportunistic spectrum access (OSA) strategy for a slotted secondary user (SU) overlaying an unslotted ON/OFF continuous time Markov chain (CTMC) modeled primary network is proposed. The OSA strategy is investigated via a cross-layer optimization approach, with joint consideration of sensing period (related to PHY layer) and transmission time (related to MAC layer), which will affect both interference and energy consumption. Two access policies are investigated in this paper; that is, SU transmits only in "OFF slots" (i.e., the slots that the sensing results are OFF) and transmits in both "OFF slots" and "ON slots". The allocation of sensing period and transmission time for two access policies is investigated and analyzed by means of geometric methods. The closed form solutions are derived, which show that SU should transmit in "OFF slots" as much as possible, and that the proposed OSA strategy has low computational cost. Numerical results also show that with the proposed policies, SU can efficiently access the channel and meanwhile consume less energy and time to sense.