Simultaneous Wireless Information and Power Transfer in Multi-User OFDMA Networks with Physical Secrecy
This paper considers simultaneous wireless information and power transfer (SWIPT) from a base station to multiple Internet of Things (IoT) nodes via orthogonal frequency-division multiple access (OFDMA), where every node can eavesdrop on the subcarriers allocated to other nodes. Application layer en...
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-05-01
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| Series: | Sensors |
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| Online Access: | https://www.mdpi.com/1424-8220/22/10/3814 |
| _version_ | 1797495708947841024 |
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| author | Pubet Sangmahamad Kampol Woradit Poompat Saengudomlert |
| author_facet | Pubet Sangmahamad Kampol Woradit Poompat Saengudomlert |
| author_sort | Pubet Sangmahamad |
| collection | DOAJ |
| description | This paper considers simultaneous wireless information and power transfer (SWIPT) from a base station to multiple Internet of Things (IoT) nodes via orthogonal frequency-division multiple access (OFDMA), where every node can eavesdrop on the subcarriers allocated to other nodes. Application layer encryption is unsuitable for IoT nodes relying on energy harvesting, and physical layer secrecy should be deployed. The different channels among users on every subcarrier can be exploited to obtain physical layer secrecy without using artificial noise. We propose an algorithm to maximize the secrecy rate of IoT nodes by jointly optimizing the power splitting ratio and subcarrier allocation. For fairness, the lowest total secrecy rate among users is maximized. Through simulations, the proposed algorithm is compared with the minimum effort approach, which allocates each subcarrier to the strongest node and selects the minimum sufficient power splitting ratio. The obtained secrecy rate is 3 times (4.5 over 1.5 bps/Hz) higher than that of the minimum effort approach in every case of parameters: the base station’s transmit power, the minimum harvested energy requirement of an IoT node and the energy harvesting efficiency. |
| first_indexed | 2024-03-10T01:53:26Z |
| format | Article |
| id | doaj.art-e3407ae925fe452bab8ceffac543098a |
| institution | Directory Open Access Journal |
| issn | 1424-8220 |
| language | English |
| last_indexed | 2024-03-10T01:53:26Z |
| publishDate | 2022-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Sensors |
| spelling | doaj.art-e3407ae925fe452bab8ceffac543098a2023-11-23T13:01:42ZengMDPI AGSensors1424-82202022-05-012210381410.3390/s22103814Simultaneous Wireless Information and Power Transfer in Multi-User OFDMA Networks with Physical SecrecyPubet Sangmahamad0Kampol Woradit1Poompat Saengudomlert2Department of Electronics and Telecommunication Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi, Pathum Thani 12110, ThailandOptimization Theory and Applications for Engineering Systems Research Group, Department of Computer Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, ThailandBangkok University Center of Research in Optoelectronics, Communications and Computational Systems, School of Engineering, Bangkok University, Pathum Thani 12120, ThailandThis paper considers simultaneous wireless information and power transfer (SWIPT) from a base station to multiple Internet of Things (IoT) nodes via orthogonal frequency-division multiple access (OFDMA), where every node can eavesdrop on the subcarriers allocated to other nodes. Application layer encryption is unsuitable for IoT nodes relying on energy harvesting, and physical layer secrecy should be deployed. The different channels among users on every subcarrier can be exploited to obtain physical layer secrecy without using artificial noise. We propose an algorithm to maximize the secrecy rate of IoT nodes by jointly optimizing the power splitting ratio and subcarrier allocation. For fairness, the lowest total secrecy rate among users is maximized. Through simulations, the proposed algorithm is compared with the minimum effort approach, which allocates each subcarrier to the strongest node and selects the minimum sufficient power splitting ratio. The obtained secrecy rate is 3 times (4.5 over 1.5 bps/Hz) higher than that of the minimum effort approach in every case of parameters: the base station’s transmit power, the minimum harvested energy requirement of an IoT node and the energy harvesting efficiency.https://www.mdpi.com/1424-8220/22/10/3814secrecy ratesubcarrier allocationpower splitting ratioenergy harvestwireless powered communicationssimultaneous wireless information and power transfer |
| spellingShingle | Pubet Sangmahamad Kampol Woradit Poompat Saengudomlert Simultaneous Wireless Information and Power Transfer in Multi-User OFDMA Networks with Physical Secrecy Sensors secrecy rate subcarrier allocation power splitting ratio energy harvest wireless powered communications simultaneous wireless information and power transfer |
| title | Simultaneous Wireless Information and Power Transfer in Multi-User OFDMA Networks with Physical Secrecy |
| title_full | Simultaneous Wireless Information and Power Transfer in Multi-User OFDMA Networks with Physical Secrecy |
| title_fullStr | Simultaneous Wireless Information and Power Transfer in Multi-User OFDMA Networks with Physical Secrecy |
| title_full_unstemmed | Simultaneous Wireless Information and Power Transfer in Multi-User OFDMA Networks with Physical Secrecy |
| title_short | Simultaneous Wireless Information and Power Transfer in Multi-User OFDMA Networks with Physical Secrecy |
| title_sort | simultaneous wireless information and power transfer in multi user ofdma networks with physical secrecy |
| topic | secrecy rate subcarrier allocation power splitting ratio energy harvest wireless powered communications simultaneous wireless information and power transfer |
| url | https://www.mdpi.com/1424-8220/22/10/3814 |
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