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In Cognitive Radio Mobile Ad hoc NETworks (CR-MANETs), secondary users can cooperatively sense the spectrum to detect the presence of primary users. In this paper, the authors propose a fully distributed and scalable cooperative spectrum sensing scheme based on recent advances in consensus algorithms. In the proposed scheme, the secondary users can maintain coordination based on only local information exchange without a centralized common receiver. They use the consensus of secondary users to make the final decision. The proposed scheme is essentially based on recent advances in consensus algorithms that have taken inspiration from complex natural phenomena including flocking of birds, schooling of fish, swarming of ants and honeybees.
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