Physical Layer Security for Wireless-Powered Ambient Backscatter Cooperative Communication Networks

Low power consumption and high spectrum efficiency as the great challenges for multi-device access to Internet-of-Things (IoT) have put forward stringent requirements on future intelligent network. Ambient backscatter communication (ABcom) is regarded a promising technology cope with two challenges, where device (BD) can reflect ambient radio frequency (RF) signals without additional bandwidth. However, minimalist structural design of BD makes ABcom security vulnerable in wireless propagation environments. By virtue this fact, paper considers physical layer (PLS) wireless-powered cooperative network threatened by an eavesdropper, nonlinear energy harvesting model cooperates decode-and-forward (DF) relay secure communication. The PLS performance investigated deriving secrecy outage probability (SOP) (SEE). Specifically, closed-form asymptotic expressions SOP are derived well diversity order first time. As energy-constrained device, balancing major concern BD, thus SEE proposed studied. results from numerical analysis show that improvement impacted system parameters, including transmit power, rate threshold, reflection distance between source which provide guidance networks.