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Optimal System Performance in Multihop Energy Harvesting WSNs Using Cooperative NOMA and Friendly Jammers
International School, Duy Tan University, Da Nang, Vietnam.
Department of Computer Science, Faculty of Science, Applied Network Technology (ANT) Laboratory, Khon Kaen University, Khon Kaen, Thailand.
Faculty of Electrical and Electronics Engineering, Duy Tan University, Da Nang, Vietnam.
Mälardalen University, School of Innovation, Design and Engineering, Embedded Systems.
2019 (English)In: IEEE Access, E-ISSN 2169-3536, Vol. 7, p. 125494-125510, article id 8824086Article in journal (Refereed) Published
Abstract [en]

In this paper, we investigate the system performance of multihop energy harvesting (EH) wireless sensor networks (WSNs) with imperfect channel state information (CSI) using cooperative non-orthogonal multiple access (NOMA) and friendly jammers in the presence of multiple passive eavesdroppers (EAVs). Specifically, we propose a two-phase communication protocol consisting of EH and information transmission (IT). In the first phase, relays in all clusters harvest energy from power transfer station (PTS) signals. In the first time slot of the second phase, the gateway simultaneously broadcasts information and interference signals. In the subsequent time slots, a relay acting as a friendly jammer in each cluster uses the harvested energy to send an interference signal. Simultaneously, another EH relay applies the NOMA technique to transmit the information signal according to an optimal scheduling scheme based on the maximum signal-to-interference-plus-noise ratio (SINR) of a far user (MSm) and a near user (MSn). To ensure security performance, we propose an algorithm for determining the EH time constraint for a friendly jammer. Additionally, closed-form expressions for the outage probability and throughput of the considered system are derived. Accordingly, an optimal power allocation coefficient algorithm is proposed to achieve throughput fairness for pairs of users. The results of the mathematical analysis are verified by Monte Carlo simulations. Finally, the numerical results demonstrate that the MSn scheme is recommended for guaranteeing throughput fairness for pairs of users. 

Place, publisher, year, edition, pages
2019. Vol. 7, p. 125494-125510, article id 8824086
Keywords [en]
Energy harvesting, friendly jammer, imperfect CSI, multihop wireless sensor networks, NOMA
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:mdh:diva-45369DOI: 10.1109/ACCESS.2019.2939385ISI: 000487080300003Scopus ID: 2-s2.0-85072584427OAI: oai:DiVA.org:mdh-45369DiVA, id: diva2:1357171
Available from: 2019-10-03 Created: 2019-10-03 Last updated: 2019-10-11Bibliographically approved

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Tran, Hung Vinh

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