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Existing authentication protocols to secure vehicular ad hoc networks (VANETs) raise challenges such as certificate distribution and revocation, avoidance of computation and communication bottlenecks, and reduction of the strong reliance on tamper-proof devices. This paper efficiently copes with these challenges with a decentralized group-authentication protocol in the sense that the group is maintained...
In a cognitive radio network, cooperative spectrum sensing is conducted among the secondary users so as to improve the sensing performance. However, it's not necessary to cooperate all users to perform spectrum sensing while achieve a given error bound. In this paper, we investigate the problem of optimal number of secondary users in cooperative spectrum sensing. Moreover, an efficient and robust...
This paper considers spectrally efficient anti-jamming system design based on message-driven frequency hopping (MDFH). We first analyze the performance of the MDFH system under different jamming scenarios. It is observed that MDFH is particularly robust under strong jamming. However, it experiences a performance bottleneck under disguised jamming, for which the jamming power is close to the signal...
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