Cooperative Physical Layer Security Transmission Scheme Based on Energy Harvesting
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Cooperative Physical Layer Security Transmission Scheme Based on Energy Harvesting Lishuang Dong1 · Jialun Li1 · Xiaomei Fu2 Accepted: 14 September 2020 © Springer Science+Business Media, LLC, part of Springer Nature 2020
Abstract Energy harvesting (EH) is introduced into the physical layer security transmission of wireless sensor networks. It takes the energy efficiency and security into account simultaneously. To improve the physical layer security of the cooperative wireless sensor network, an EH-based physical layer security transmission scheme called multi-relay time switching (MRTS) is proposed in this paper. In the multi-source single-destination network with eavesdroppers, multiple relay nodes with time switching (TS) protocol convert the received signals into energy and information according to the time slots, and the converted energy is used to amplify and forward the received information. The research shows the optimal time switching ratio, under which the maximum secrecy capacity is achievable with the optimal converted energy. The results prove that under the same conditions, the secure transmission scheme based on MRTS is better than power splitting-based relaying (PSR) scheme when the total power of sources is limited. Keywords Physical layer security · Energy harvesting · Cooperation · Secrecy capacity · Multi-relay
1 Introduction Physical layer security methods can effectively prevent wireless sensor networks from eavesdropping and improve the security of wireless networks by utilizing the physical characteristics of wireless channels, such as environment noise and multi-path fading [1–3]. Secrecy capacity is commonly used to measure physical layer security, which is the maximum rate at which the source node can safely send information to its destination node
* Xiaomei Fu [email protected] Lishuang Dong [email protected] Jialun Li [email protected] 1
School of Electrical and Information Engineering, Tianjin University, Tianjin 300072, China
2
School of Marine Science and Technology, Tianjin University, Tianjin 300072, China
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with eavesdroppers. Cooperative relay strategy is one of the practical techniques which can effectively improve transmission security [4, 5]. Cooperative relay strategies comprise Amplify and Forward (AF), Decode and Forward (DF), Noise Forward (NF), and other cooperative mechanisms can also be used to improve the physical layer security [6]. In recent years, the proposal of Simultaneous Wireless Information and Power Transfer (SWIPT), has greatly improved the efficiency of energy utilization in wireless networks [7, 8]. In SWIPT mechanism, nodes in wireless networks can receive Radio Frequency (RF) signals from the surrounding environment to realize energy self-sufficiency. Therefore, radio frequency Energy Harvesting (EH) technology has become a research hotspot in wireless communication, especially when battery equipments are difficult to replace or recharge [9, 10]. Cooperative relay in wireless networks can simultane
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