Design of Relay Switching to Combat an Eavesdropper in IoT-NOMA Wireless Networks

Thanh-Nam Tran, Ho Van-Cuu, Thoai Phu Vo, Khanh Ngo Nhu Tran and Miroslav Voznak
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Thanh-Nam Tran: Faculty of Electrical Engineering and Computer Science, VSB-Technical University of Ostrava, 17. Listopadu 2172/15, 708 00 Ostrava, Czech Republic
Ho Van-Cuu: Faculty of Electronics and Communications, Sai Gon University, No. 273 An Duong Vuong Street, 5th District, Hochiminh 700 00, Vietnam
Thoai Phu Vo: Faculty of Electrical and Electronics Engineering, Ton Duc Thang University, No. 19 Nguyen Huu Tho Street, 7th District, Hochiminh 700 00, Vietnam
Khanh Ngo Nhu Tran: Faculty of Information Technology, Da Lat University, No. 1 Phu Dong Thien Vuong Street, Da Lat 67 0000, Vietnam
Miroslav Voznak: Faculty of Electrical Engineering and Computer Science, VSB-Technical University of Ostrava, 17. Listopadu 2172/15, 708 00 Ostrava, Czech Republic

Future Internet, 2022, vol. 14, issue 3, 1-22

Abstract: The requirements of low latency, low cost, less energy consumption, high flexibility, high network capacity, and high data safety are crucial challenges for future Internet of Things (IoT) wireless networks. Motivated by these challenges, this study deals with a novel design of green-cooperative IoT network, which employed coupled relays consisting of one IoT relay selected for forwarding signals to multiple IoT devices while another IoT relay transmitted jamming signals to an eavesdropper. For flexibility, all IoT nodes were powered by solar energy enough to sustain themselves, in order to consume less energy. To reach low latency, the study adopted the emerging non-orthogonal multiple access technique to serve multiple IoT devices simultaneously. Furthermore, the study adopted the simultaneous wireless information and power transfer technique which transmits wireless data for information processing and energy for energy harvesting. The study sketched a novel transmission block time period framework which plotted how a signal could travel via an individual IoT model. Maximizing the achievable bit-rate of IoT devices was considered to improve network capacity and data safety as well. Aiming at enhancing secrecy performance, a rest IoT relay played a role as a friendly jammer to transmit a jamming signal to an eavesdropper using energy harvested from the power splitting protocol. The results achieved in this study showed that the proposed model satisfied the requirements of future green IoT wireless networks. Derivatives leading to closed-form expressions are presented and verified by simulation results. The investigated results demonstrated that a friendly jammer based on radio frequency and energy harvesting strongly forces the intercept probability performance of the eavesdropper towards one, while outage probability performance of IoT devices towards zero showed that the signal to noise ratio tends to infinity.

Keywords: multi-input-multi-output (MIMO); non-orthogonal multiple access (NOMA); cooperative communications; Internet of Things-relay selection (IoT-RS); energy harvesting (EH); intercept probability (search for similar items in EconPapers)
JEL-codes: O3 (search for similar items in EconPapers)
Date: 2022
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