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Secrecy Performance Analysis for Fixed-Gain Energy Harvesting in an Internet of Things with Untrusted Relays

Authors:

Van Nhan Vo , Dung Duc Tran , Chakchai So-In , Tran Hung

Research group:


Publication Type:

Journal article

Venue:

IEEE Access

Publisher:

IEEE

DOI:

10.1109/ACCESS.2018.2867500


Abstract

In this paper, the radio frequency (RF) energy harvesting (EH) and security issues in Internet of Things (IoT) sensor networks with multiple untrusted relays are considered. In particular, the communication protocol is divided into two phases. The first phase is used for EH, in which the IoT sensor nodes (SNs) and relays harvest energy from multiple power transfer stations (PTSs). The second phase is used for information transmission in two steps: 1) the selected SN uses the harvested energy to broadcast information to the controller and the relays, and 2) the selected relay forwards information to the controller by applying the amplify-and-forward (AF) protocol to improve the quality of the communication between the SN and the controller. During information transmission, the controller is at risk of losing information because the relay may act as an eavesdropper (namely an untrusted relay). Thus, to improve the secrecy performance of the considered system, we propose an optimal scheme, namely best-sensor-best-untrusted-relay (BSBR), and compare this scheme with random-sensor-random-untrustedrelay (RSRR) and a threshold-based scheme. The closed-form expressions for the secrecy outage probability (SOP) and secrecy throughput (ST) are obtained and verified through Monte Carlo simulations to confirm the superior performance of our approach. EH time optimization and target secrecy rate optimization algorithms are also proposed. In addition, the impacts of the EH time, the EH efficiency coefficient, the numbers of SNs and untrusted relays, and the target secrecy rate on the SOP and the ST are investigated. The results indicate that the BSBR generally outperforms the two baseline schemes in terms of the SOP and ST.

Bibtex

@article{Nhan Vo5217,
author = {Van Nhan Vo and Dung Duc Tran and Chakchai So-In and Tran Hung},
title = {Secrecy Performance Analysis for Fixed-Gain Energy Harvesting in an Internet of Things with Untrusted Relays},
editor = {IEEE},
volume = {PP},
number = {99},
pages = {1--12},
month = {August},
year = {2018},
journal = {IEEE Access},
publisher = {IEEE},
url = {http://www.es.mdu.se/publications/5217-}
}