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In Cognitive Radio systems, cooperative spectrum sensing in the physical layer is highly desired to detect the Primary User accurately and to guarantee the Quality of Service (QoS) of the Primary User. Due to the energy consumption in sensing the channels, the selfish users may not be willing to contribute to the cooperative sensing while they want to occupy more idle channels observed. To deal with this problem, the authors propose in this paper a game theoretic approach which will advocate users to spend power to sense the channel by using the access opportunity in the MAC layer as a payoff.
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