Routing and QoS provisioning in cognitive radio networks
Computer Networks: The International Journal of Computer and Telecommunications Networking
End-to-end protocols for Cognitive Radio Ad Hoc Networks: An evaluation study
Performance Evaluation
Computer Networks: The International Journal of Computer and Telecommunications Networking
A survey of common control channel design in cognitive radio networks
Physical Communication
A Cluster-Based MAC Protocol for Cognitive Radio Ad Hoc Networks
Wireless Personal Communications: An International Journal
Distributed cooperative spectrum sensing in cognitive radio for ad hoc networks
Computer Communications
Licensed user activity estimation and track in mobile cognitive radio ad hoc networks
Computers and Electrical Engineering
A decentralized MAC protocol for opportunistic spectrum access in cognitive wireless networks
Computer Communications
Sensing Confidence Level-Based Joint Spectrum and Power Allocation in Cognitive Radio Networks
Wireless Personal Communications: An International Journal
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Cognitive radio (CR) technology allows devices to opportunistically use the vacant portions of the licensed wireless spectrum. However, the available spectrum changes dynamically with the primary user (PU) activity, necessitating frequent PU sensing coordination and exchanging network topology information in a multihop CR ad hoc network. To facilitate these tasks, an always-on, out-of-band common control channel (CCC) design is proposed that uses noncontiguous OFDM subcarriers placed within the guard bands separating the channels of the licensed spectrum. First, the task of choosing the OFDM-specific parameters, including the number, power, and bandwidth of the subcarriers is formulated as a feasibility problem to ensure that the CCC does not adversely interfere with the PU operation. Second, for unicast messaging between a given pair of users, a subset of the guard bands may be chosen, which allows an additional measure of protection for the adjacent PU spectrum. For this, the multiarm bandit algorithm is used that allows the guard band selection to evolve over time based on the observed interference from the PU. Results reveal that our proposed CCC ensures connectivity and improved PU protection with a limited trade-off in data rate when compared to frequency-hopping and cluster-based CCC schemes.