Physical Layer Security in Two-Way SWIPT Relay Networks with Imperfect CSI and a Friendly Jammer
In this paper, the security of two-way relay communications in the presence of a passive eavesdropper is investigated. Two users communicate via a relay that depends solely on energy harvesting to amplify and forward the received signals. Time switching is employed at the relay to harvest energy and...
| Main Authors: | , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
MDPI AG
2023-01-01
|
| Series: | Entropy |
| Subjects: | |
| Online Access: | https://www.mdpi.com/1099-4300/25/1/122 |
| _version_ | 1827626104777605120 |
|---|---|
| author | Maymoona Hayajneh Thomas Aaron Gulliver |
| author_facet | Maymoona Hayajneh Thomas Aaron Gulliver |
| author_sort | Maymoona Hayajneh |
| collection | DOAJ |
| description | In this paper, the security of two-way relay communications in the presence of a passive eavesdropper is investigated. Two users communicate via a relay that depends solely on energy harvesting to amplify and forward the received signals. Time switching is employed at the relay to harvest energy and obtain user information. A friendly jammer is utilized to hinder the eavesdropping from wiretapping the information signal. The eavesdropper employs maximal ratio combining and selection combining to improve the signal-to-noise ratio of the wiretapped signals. Geometric programming (GP) is used to maximize the secrecy capacity of the system by jointly optimizing the time switching ratio of the relay and transmit power of the two users and jammer. The impact of imperfect channel state information at the eavesdropper for the links between the eavesdropper and the other nodes is determined. Further, the secrecy capacity when the jamming signal is not perfectly cancelled at the relay is examined. The secrecy capacity is shown to be greater with a jammer compared to the case without a jammer. The effect of the relay, jammer, and eavesdropper locations on the secrecy capacity is also studied. It is shown that the secrecy capacity is greatest when the relay is at the midpoint between the users. The closer the jammer is to the eavesdropper, the higher the secrecy capacity as the shorter distance decreases the signal-to-noise ratio of the jammer. |
| first_indexed | 2024-03-09T12:49:11Z |
| format | Article |
| id | doaj.art-96ecc610831c448ea3d55a0bb47e801b |
| institution | Directory Open Access Journal |
| issn | 1099-4300 |
| language | English |
| last_indexed | 2024-03-09T12:49:11Z |
| publishDate | 2023-01-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Entropy |
| spelling | doaj.art-96ecc610831c448ea3d55a0bb47e801b2023-11-30T22:08:58ZengMDPI AGEntropy1099-43002023-01-0125112210.3390/e25010122Physical Layer Security in Two-Way SWIPT Relay Networks with Imperfect CSI and a Friendly JammerMaymoona Hayajneh0Thomas Aaron Gulliver1Department of Electrical and Computer Engineering, University of Victoria, P.O. Box 1700, STN CSC, Victoria, BC V8W 2Y2, CanadaDepartment of Electrical and Computer Engineering, University of Victoria, P.O. Box 1700, STN CSC, Victoria, BC V8W 2Y2, CanadaIn this paper, the security of two-way relay communications in the presence of a passive eavesdropper is investigated. Two users communicate via a relay that depends solely on energy harvesting to amplify and forward the received signals. Time switching is employed at the relay to harvest energy and obtain user information. A friendly jammer is utilized to hinder the eavesdropping from wiretapping the information signal. The eavesdropper employs maximal ratio combining and selection combining to improve the signal-to-noise ratio of the wiretapped signals. Geometric programming (GP) is used to maximize the secrecy capacity of the system by jointly optimizing the time switching ratio of the relay and transmit power of the two users and jammer. The impact of imperfect channel state information at the eavesdropper for the links between the eavesdropper and the other nodes is determined. Further, the secrecy capacity when the jamming signal is not perfectly cancelled at the relay is examined. The secrecy capacity is shown to be greater with a jammer compared to the case without a jammer. The effect of the relay, jammer, and eavesdropper locations on the secrecy capacity is also studied. It is shown that the secrecy capacity is greatest when the relay is at the midpoint between the users. The closer the jammer is to the eavesdropper, the higher the secrecy capacity as the shorter distance decreases the signal-to-noise ratio of the jammer.https://www.mdpi.com/1099-4300/25/1/122amplify and forwardeavesdropperimperfect channel state informationrelaysecrecy capacitysimultaneous wireless information and power transfer |
| spellingShingle | Maymoona Hayajneh Thomas Aaron Gulliver Physical Layer Security in Two-Way SWIPT Relay Networks with Imperfect CSI and a Friendly Jammer Entropy amplify and forward eavesdropper imperfect channel state information relay secrecy capacity simultaneous wireless information and power transfer |
| title | Physical Layer Security in Two-Way SWIPT Relay Networks with Imperfect CSI and a Friendly Jammer |
| title_full | Physical Layer Security in Two-Way SWIPT Relay Networks with Imperfect CSI and a Friendly Jammer |
| title_fullStr | Physical Layer Security in Two-Way SWIPT Relay Networks with Imperfect CSI and a Friendly Jammer |
| title_full_unstemmed | Physical Layer Security in Two-Way SWIPT Relay Networks with Imperfect CSI and a Friendly Jammer |
| title_short | Physical Layer Security in Two-Way SWIPT Relay Networks with Imperfect CSI and a Friendly Jammer |
| title_sort | physical layer security in two way swipt relay networks with imperfect csi and a friendly jammer |
| topic | amplify and forward eavesdropper imperfect channel state information relay secrecy capacity simultaneous wireless information and power transfer |
| url | https://www.mdpi.com/1099-4300/25/1/122 |
| work_keys_str_mv | AT maymoonahayajneh physicallayersecurityintwowayswiptrelaynetworkswithimperfectcsiandafriendlyjammer AT thomasaarongulliver physicallayersecurityintwowayswiptrelaynetworkswithimperfectcsiandafriendlyjammer |