Optimal channel probing and transmission scheduling for opportunistic spectrum access
Proceedings of the 13th annual ACM international conference on Mobile computing and networking
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IEEE/ACM Transactions on Networking (TON)
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IEEE Journal on Selected Areas in Communications
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IEEE Journal on Selected Areas in Communications
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IEEE Transactions on Wireless Communications
Restless watchdog: selective quickest spectrum sensing in multichannel cognitive radio systems
EURASIP Journal on Advances in Signal Processing - Special issue on dynamic spectrum access for wireless networking
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GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
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GLOBECOM'09 Proceedings of the 28th IEEE conference on Global telecommunications
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ICC'09 Proceedings of the 2009 IEEE international conference on Communications
Probability-based periodic spectrum sensing during secondary communication
IEEE Transactions on Communications
Sequential and cooperative sensing for multi-channel cognitive radios
IEEE Transactions on Signal Processing
Optimal multi-channel cooperative sensing in cognitive radio networks
IEEE Transactions on Wireless Communications
IEEE Transactions on Wireless Communications
Distributed opportunistic scheduling with two-level probing
IEEE/ACM Transactions on Networking (TON)
Coordination of multi-link spectrum handoff in multi-radio multi-hop cognitive networks
Journal of Parallel and Distributed Computing
Optimal Channel Sensing Order for Various Applications in Cognitive Radio Networks
Wireless Personal Communications: An International Journal
Sequential sensing based spectrum handoff in cognitive radio networks with multiple users
Computer Networks: The International Journal of Computer and Telecommunications Networking
Wireless Personal Communications: An International Journal
Optimal non-identical sensing setting for multi channels in cognitive radio networks
Computer Communications
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This paper investigates the optimal sensing order problem in multi-channel cognitive medium access control with opportunistic transmissions. The scenario in which the availability probability of each channel is known is considered first. In this case, when the potential channels are identical (except for the availability probabilities) and independent, it is shown that, although the intuitive sensing order (i.e., descending order of the channel availability probabilities) is optimal when adaptive modulation is not used, it does not lead to optimality in general with adaptive modulation. Thus, a dynamic programming approach to the search for an optimal sensing order with adaptive modulation is presented. For some special cases, it is proved that a simple optimal sensing order does exist. More complex scenarios are then considered, e.g., in which the availability probability of each channel is unknown. Optimal strategies are developed to address the challenges created by this additional uncertainty. Finally, a scheme is developed to address the issue of sensing errors.