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Open AccessArticle

Secure Communication in Cooperative SWIPT NOMA Systems with Non-Linear Energy Harvesting and Friendly Jamming

Department of Information & Communication Engineering, Kongju National University, 1223-24 Cheonan-dae-ro, Cheonan 31080, Korea
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Sensors 2020, 20(4), 1047; https://doi.org/10.3390/s20041047 (registering DOI)
Received: 1 January 2020 / Revised: 4 February 2020 / Accepted: 10 February 2020 / Published: 14 February 2020
(This article belongs to the Section Sensor Networks)
This paper studies the secure communication of a non-orthogonal multiple-access (NOMA) relaying system in the presence of an eavesdropper in which the NOMA communication between a source and two users is assisted by an energy-harvesting (EH) relay. The relay extracts a part of its received signal strength using a power-splitting (PS) policy then harvests energy using a non-linear EH (NLEH) circuit. A friendly jammer sends jamming signals to help secure communication. The jammer is exploited as an additional energy source. A store-and-transmit (SaT) scheme which allows the EH relay to perform energy storing and information transmitting is proposed. For performance evaluation, the closed-form expressions for three metrics, secrecy outage probability (SOP), average achievable secrecy rate (AASR) and average stored energy (ASE) are derived. These results enable studies on the effects of various system parameters, such as NOMA power-allocation factors, target secrecy rates, jammer’s location, and relay’s power levels, on the system performance. View Full-Text
Keywords: physical layer security; non-linear energy harvesting; non-orthogonal multiple-access (NOMA); cooperative communication; friendly jamming physical layer security; non-linear energy harvesting; non-orthogonal multiple-access (NOMA); cooperative communication; friendly jamming
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Tuan, V.P.; Hong, I.-P. Secure Communication in Cooperative SWIPT NOMA Systems with Non-Linear Energy Harvesting and Friendly Jamming. Sensors 2020, 20, 1047.

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