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Recent years were marked by a rapid development of mobile technologies. Contemporary mobile devices equipped with powerful processor and a variety of additional sensors open new opportunities to track user position. Crowdsourcing is a new field of research devoted to data retrieval from a crowd of users. Mobile users actively participate in collection of datasets consisting of position, power of received...
In this paper, a cognitive radio network which consists of a primary system with a pair of primary transmitter (PT) and a primary receiver (PR), and a secondary system with a secondary transmitter (ST), a secondary receiver (SR) and a secondary relay (R) is considered. It is assumed that the distances between the transmitter and receiver of both systems are so large that the aid of a relay is needed...
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