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In cognitive radio networks, secondary users can implement cooperative spectrum sensing to achieve better performance than single secondary user sensing. However, the accuracy of cooperative sensing can be severely degraded when the report and inter-user channels experience fading in reality. Aiming at solving this problem, we proposed a chain-based OR-rule cooperative spectrum sensing scheme. To...
In this paper, a cooperative communication scheme using smart antenna is proposed for cognitive radio networks. This scheme expands the concept of cognitive radio in time and space. Using the cooperation, spectrum sensing accuracy and throughput of cognitive radio networks can be observably increased. The licensed users' detection and unlicensed users' transmission are almost carried on simultaneously...
Cognitive radio (CR) is a revolution in radio technology. Cognitive radio networks (CRN) is featured by the dynamic spectrum sharing of the secondary nodes coexisting with the primary nodes. Secondary nodes in cognitive radio networks (CRN) need the ability to work on different frequency bands and intelligently adjust their configuration to changes in the communication environment. It is a complicated...
This paper proposes an optimal soft fusion scheme for cooperative spectrum sensing in cognitive radio (CR) network. Multiple cooperative secondary users (SUs) simply serve as relay nodes in the network to provide space diversity for spectrum sensing. An optimal soft fusion scheme of the relayed sensing observations is derived in Neyman-Pearson framework, on the basis of maximizing the deflection coefficient...
Cognitive radio systems offer the opportunity to improve spectrum utilization while avoiding the interference to primary users. Secondary users must be aware of interference caused to primary users. Therefore cognitive radio network should take primary users into account and control their transmission power. This paper focuses on the coverage analysis of cognitive radio network and finds its coverage...
Cognitive radio systems offer the opportunity to improve spectrum utilization while avoiding the interference to primary users. On the one hand, secondary users must be aware of the interference caused to primary users. Therefore, cognitive radio network should control their transmission power. On the other hand, the interference from primary network may degrade the performance of cognitive network...
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