Abstract
Overlay networks allow the unlicensed transmitter (\(UT \)) to aid the licensed transmitter (\(LT \)) by sending the superimposed signal including messages of both \(UT \) and \(LT \) with a higher prerogative for \(LT \)’s message. Such unequal message prerogatives enable efficient non-orthogonal multiple access (NOMA)-assisted decoding, a.k.a. successive interference cancellation, at corresponding receivers. Alongside the license of accessing the frequency band of \(LT \), \(UT \) is further beneficial with its transmission powered merely by energy harvested from \(LT \). Realistically, radio frequency energy harvester is not linear and message transmission in overlay networks is prone to wire-tapping of eavesdroppers. Accordingly, this paper recommends an analysis framework for security performance metrics—secrecy throughput and secrecy outage probability—of overlay networks with nonlinear energy scavenging and NOMA-assisted decoding. The proposed framework facilitates in assessing and comparing security performance in indispensable specifications and serves perfectly as a design guideline. Obtained results reveal that overlay networks with NOMA-assisted decoding are more secure than its OMA and NOMA-unsupported decoding counterparts and suffer error floor at high saturation power threshold or high licensed transmit power. Further, their performance is enhanced with an increase in message processing time and distance between unlicensed and licensed transmitters.
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Notes
Stage 1 is allocated merely for \(UT \) to harvest energy. Consequently, \(t_l\) is not message bearing signal. Nonetheless, to reduce the number of notations without engendering any confusion, we also imply \(t_l\) as the message bearing signal in Stage 2.
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We acknowledge Ho Chi Minh City University of Technology (HCMUT), VNU-HCM for supporting for this study.
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Le-Thanh, T., Ho-Van, K. Overlay Networks with Nonlinear Energy Scavenging and NOMA-Assisted Decoding: Security Performance Analysis. Arab J Sci Eng 47, 14789–14807 (2022). https://doi.org/10.1007/s13369-022-06973-5
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DOI: https://doi.org/10.1007/s13369-022-06973-5