A survey on MAC protocols for cognitive radio networks
Ad Hoc Networks
IEEE Transactions on Wireless Communications
INFOCOM'10 Proceedings of the 29th conference on Information communications
Distributed power control for cognitive user access based on primary link control feedback
INFOCOM'10 Proceedings of the 29th conference on Information communications
Probabilistic resource allocation for opportunistic spectrum access
IEEE Transactions on Wireless Communications
Optimal multi-channel cooperative sensing in cognitive radio networks
IEEE Transactions on Wireless Communications
Collision-minimizing CSMA and its applications to wireless sensor networks
IEEE Journal on Selected Areas in Communications
Cognitive radio: brain-empowered wireless communications
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
Detection of Small-Scale Primary Users in Cognitive Radio Networks
IEEE Journal on Selected Areas in Communications
IEEE Journal on Selected Areas in Communications
Cognitive Radio Through Primary Control Feedback
IEEE Journal on Selected Areas in Communications
Decentralized Cognitive Radio Control Based on Inference from Primary Link Control Information
IEEE Journal on Selected Areas in Communications
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Cognitive radio network (CRN) is an emerging technology that can increase the utilization of spectrum underutilized by primary users (PUs). In the literature, most exiting investigations on CRNs have focused on how secondary users (SUs) can coexist harmlessly with the PUs. Despite the importance of such a coexistence issue, it is also crucial to investigate the coexistence of SUs because (i) the PUs usually rarely use the licensed spectrum and (ii) the advantages of CRN will significantly increase the number of SUs in the future. To address this challenging issue, we propose, in this paper, an optimal randomized spectrum access scheme, whose main ideas include the following: (i) an SU shares its sensing results with neighboring SUs and (ii) with the regional sensing results, an SU will access available channels with a non-uniform probability distribution. We first formulate a multichannel optimal randomized multiple access (MC-ORMA) problem that aims to maximize the throughput of the CRN; we then develop efficient distributed algorithms to solve the MC-ORMA problem; we derive the closed-form value of collision probability for each SU; and finally, we conduct extensive numerical experiments and compare our theoretical analysis with simulation results to demonstrate the advantages of our scheme. Copyright © 2011 John Wiley & Sons, Ltd.