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In this paper, a cognitive classification and parameter estimation technique for the UWB through-wall propagation channel is proposed. For an investigated channel, a closed-loop cognitive radio system is proposed and the membership degree of each hypothesis channel is obtained for the channel classification and parameter estimation. The system contains an adaptive wave design technique in the transmitter,...
In this paper, we propose an approach for detecting primary user emulation attacks in cognitive radio networks. Cognitive radios (CRs) have been proposed as a promising solution for improving spectrum utilization via opportunistic spectrum sharing. In a CR network environment, primary (licensed) users have priority over secondary (unlicensed) users when accessing the wireless channel. Thus, if a malicious...
This work proposes a novel algorithm for energy-efficient and reliable spectrum sensing in a cognitive network. The algorithm relies on cooperation between secondary devices, that organize themselves in clusters defined according to both sensing reliability and energy efficiency. The proposed algorithm is compared by means of computer simulations with a simpler, non cluster-based cooperative sensing...
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