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With the increasing importance of radio spectrum in the national economy and safety, this paper develops a wide area and wide band radio spectrum monitoring system which uses sensor networks. The significant contribution of the paper is introducing wireless sensor networks into the design of the spectrum monitoring system. A spectrum monitoring oriented private network architecture is designed to...
In this paper, we explore the underlay cognitive relay networks in the presence of hardware impairment. To avoid interfering with the primary user's communications, the transmission powers of the secondary source and relays are adaptively adjusted by considering the following three practical effects: i) the maximum transmission power constraint at the secondary transmission nodes, ii) the interference...
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