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Designing a solution for multi-hop cognitive radio networks poses several challenges such as the realization of the control channel, the detection of primary users and the coordination of secondary users for dynamic spectrum access purposes. In this paper, the authors discuss these challenges, and they propose a solution which aims at meeting most of them. The proposed solution is completely distributed, and does not need dedicated spectrum resources for control purposes, but rather it leverages on a virtual control channel which is implemented by having users exchange control information whenever they meet in a particular channel, using network doding techniques for better dissemination performance.
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