Physical Layer Secure Transmission in RF-Powered Energy Harvesting Untrusted Relay Networks
YANG Wei-wei1, CHEN Jian1, CHEN De-chuan1,2,3
1. College of Communication Engineering, Army Engineering University of PLA, Nanjing, Jiangsu 210007, China;
2. Wu Han Zhong Yuan Electronics Group Co., Ltd., Wuhan, Hubei 430010, China;
3. Wu Han Zhong Yuan Communication Co., Ltd., Wuhan, Hubei 430205, China
Abstract：Wireless energy harvesting is regarded as a promising energy supply alternative for energy-constrained wireless networks.In this paper,we investigate secure transmission in RF-powered energy harvesting relay networks,where an energy-constrained relay is untrusted.Considering that the energy-constrained relay can harvest energy from RF signals to forward the confidential messages,the source node with multiple antenna employs transmit antenna selection (TAS) to enhance the energy harvesting efficiency of the relay,and the destination node employs artificial interference to enhance security.Closed-form expressions of the secrecy outage probability,connection outage probability and secrecy throughput have been derived.Numerical results verify the accuracy of analytical expressions,and reveal the influence of the system parameters on the secrecy performance.
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2019, Vol. 47 
