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Cognitive radio is an exciting emerging technology that has the potential of dealing with the urgent requirement and scarcity of the radio spectrum. Although having multiple radio interfaces and available spectrum bands can generally increase the effective throughput, a problem arises as to what the best strategy to dynamically assign available bands to secondary users for maximizing throughput by...
Cognitive radio has been proposed as the means for secondary users to promote the efficient utilization of the spectrum by exploiting the existence of spectrum holes. Meanwhile, cooperative diversity techniques can improve the transmission rate and reliability of wireless networks. In this paper, both the case of relay participating in the cognitive networks and the case of relay selection are considered...
Cognitive radio is an exciting emerging technology that has the potential of dealing with the urgent requirement and scarcity of the radio spectrum. Although having multiple radio interfaces and available spectrum bands can generally increase the effective throughput, a problem arises as to which is the best strategy to dynamically assign available bands to cognitive users for maximizing energy efficiency...
This paper focuses on spectrum handover in cognitive radio networks where secondary users (SUs) opportunistically use licensed channels as long as the aggregate interference at the primary users (PUs) does not exceed a certain threshold. We incorporate power control into the proposed spectrum handover scheme to reduce the number of spectrum handovers and enhance the spectral efficiency. In our work,...
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