Abstract
This paper studies the secrecy performance of wireless power transfer (WPT)-based multi-hop transmissions in wireless sensors networks (WSNs), where legitimate nodes harvest energy from multiple power beacons (PBs) to support the multi-hop secure data transmission to a destination in the presence of an eavesdropper. Specifically, the PBs not only transfer radio frequency energy to the legitimate nodes but also act as friendly jammers to protect data transmission. To improve secrecy performance, we propose two secure scheduling schemes, named minimum node selection (MNS) scheme and optimal node selection (ONS) scheme. We then evaluate the performance of the proposed schemes in terms of the exact closed-form for secrecy outage probability (SOP) and asymptotic SOP. The developed analyses are verified by Monte-Carlo simulations. The numerical results show that the ONS scheme outperforms the MNS scheme emerging as an effective protocol for secure multi-hop transmission in WSNs. Furthermore, the effects of the number of PBs, number of hops, time switching ratio, and the secure target data rate on the system performance are also investigated.
Highlights
Wireless sensor networks (WSNs) has been emerged as a networking solution for future wireless networks supporting Internet-of-thing (IoT) ecosystems [1,2]
We study the effects of node selection on the performance of Wireless power transfer (WPT)-based multi-hop transmissions in WSNs
Let us consider a WPT-based multi-hop transmission in wireless sensor networks, as depicted in Figure 1, where a desired source in the first cluster transmits its information to a destination with the help of intermediate nodes located in K-1 cluster, with K > 1, while an eavesdropper overhears the signals transmitted by the source and relays
Summary
Wireless sensor networks (WSNs) has been emerged as a networking solution for future wireless networks supporting Internet-of-thing (IoT) ecosystems [1,2]. Energy for encoding and protecting information against eavesdropping is raising a significant burden on the traditional WSNs and IoT systems. The authors in [9] introduced the time-switching-based relaying (TSR) and power splitting-based relaying (PSR) architectures to allow energy harvesting and information processing at a battery-less relay node, which enables a wide range of attractive applications with stringent quality of services in future IoT systems and WSNs. Recently, the researches on energy harvesting address the harvesting. The PLS concept can be naturally applied to the WPT-based multi-hop transmission in WSNs, where the PBs radiate RF signals to power to the sensor nodes and generate artificial noise to degrade the eavesdropping channels. Perfect secure transmission is achieved when the channel state information (CSI) of the main channel is higher than that of the eavesdropper channel [15]
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