Secure Communications in CIoT Networks with a Wireless Energy Harvesting Untrusted Relay

摘要: The Internet of Things (IoT) represents a bright prospect that variety common appliances can connect to one another, as well with the rest Internet, vastly improve our lives. Unique communication and security challenges have been brought out by limited hardware, low-complexity, severe energy constraints IoT devices. In addition, spectrum scarcity problem has also stimulated use large number this paper, cognitive (CIoT) is considered where an network works secondary system using underlay sharing. A wireless harvesting (EH) node used relay coverage device. However, could be potential eavesdropper intercept device's messages. This paper considers secure between device (e.g., sensor) destination controller) via EH untrusted relay. Since equipped adequate supply, schemes based on destination-aided jamming are proposed power splitting (PS) time (TS) policies, called intuitive PS (Int-PS), precoded scheme (Pre-PS), TS (Int-TS) (Pre-TS), respectively. performances evaluated through metric probability successfully transmission ( P S T ), which interference constraint primary user satisfied secrecy rate positive. analyzed for schemes, closed form expressions Pre-PS Pre-TS derived validated simulation results. Numerical results show better than under similar consumption. When polices , average transmit consumption lower. influences slitting ratios discussed simulations.