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Cognitive radio systems are perspective solution for effective utilization of frequency spectrum. Essential feature of cognitive radio devices is scanning of certain frequency band and consequent decision making whether this band is used by primary user or not. In this paper several methods for detecting signals of analog and digital TV broadcasts are described and simulation results are presented...
Opportunistic unlicensed access to the (temporarily) unused frequency bands across the licensed radio spectrum is currently being investigated as a means to increase the efficiency of spectrum usage. Such opportunistic access calls for implementation of safeguards so that ongoing licensed operations are not compromised. Among different candidates, sensing-based access, where the unlicensed users transmit...
Dynamic spectrum sharing is a concept where unlicensed devices are allowed to opportunistically access unused spectrum bands. The goal of this paper is to develop and analyze a novel secondary user sensing strategy that on the average minimizes the need to take sensing measurements and therefore maximizes throughput. In particular, we focus on the IEEE 802.22 standard where the goal is to detect TV...
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