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In this paper, the problem of spectrum status determination is considered for large cognitive radio (CR) ad hoc networks. Spectrum sensing and spectrum decision are critical for cognitive radio network throughput and hence obtaining accurate knowledge of the spectrum status is vitally important to better spectrum usage decisions. The major challenge of this type of problem lies in the fact that for...
Spectrum congestion refers to the situation where there are not enough frequencies to accommodate multiple radios or radio systems operating simultaneously. For instance, spectrum congestion is not uncommon in the unlicensed band, where multiple WiFi, Bluetooth, and Zigbee radios may compete for spectrum. Although there are many studies on spectrum congestion in the unlicensed band, it is not well...
Many denial-of-service (DOS) attacks in wireless networks, such as jamming, will cause significant performance degradation to the network and thus need to be detected quickly. This becomes more important in a cognitive wireless network employing dynamic spectrum access (DSA), where it is easier for the attackers to launch DOS attacks. For instance, the attackers may pretend to be a licensed primary...
In this paper, the problem of spectrum situation reconstruction is considered for large cognitive radio ad hoc networks. The major challenge of such problem lies in the fact that only very limited measurements of spectrum occupancy may be obtained by the cognitive users for a certain location at any given time slot. This is due to both the hardware limitations as well as the tradeoff between spectrum...
In many mission-critical applications such as military operations or disaster relief efforts, wireless networks employing dynamic spectrum access enabled by cognitive radio technology gain popularity due to their high spectrum efficiency and interoperability. However, the use of cognitive radio further complicates the security problems in wireless networks and introduces additional challenges. For...
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