Securing Full-Duplex Amplify-and-Forward Relay-Aided Communications Through Processing-Time Optimization

Mohamed F. Marzban; Ahmed El Shafie; Ahmed Sultan Salem; Naofal Al-Dhahir

doi:10.1109/TVT.2022.3163376

Securing Full-Duplex Amplify-and-Forward Relay-Aided Communications Through Processing-Time Optimization

Mohamed F. Marzban, Ahmed El Shafie, Ahmed Sultan Salem, Naofal Al-Dhahir

Research output: Contribution to journal › Article › peer-review

3 Scopus citations

Abstract

We investigate physical-layer security of the full-duplex (FD) amplify-and-forward (AF) relay channel. We provide a new perspective on the problem and show that the processing time (delay) at the relay can be exploited to improve the system’s security. We show that the FD AF relay channel can be seen as an intersymbol-interference (ISI) channel, hence, the discrete-Fourier transform (DFT) can be used for data modulation and demodulation to convert the frequency-selective channel into flat-fading channel per sub-channel/sub-carrier. By exploiting the fact that the channel memory needs to be cleared by inserting the cyclic-prefix, Alice injects an artificial-noise (AN) signal that hurts the eavesdropping nodes only. The strength of this AN signal and its interference rank are controlled by the relay’s processing time.

Original language	English (US)
Pages (from-to)	6790-6794
Number of pages	5
Journal	IEEE Transactions on Vehicular Technology
Volume	71
Issue number	6
DOIs	https://doi.org/10.1109/TVT.2022.3163376
State	Published - Mar 31 2022
Externally published	Yes

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10.1109/TVT.2022.3163376

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title = "Securing Full-Duplex Amplify-and-Forward Relay-Aided Communications Through Processing-Time Optimization",

abstract = "We investigate physical-layer security of the full-duplex (FD) amplify-and-forward (AF) relay channel. We provide a new perspective on the problem and show that the processing time (delay) at the relay can be exploited to improve the system{\textquoteright}s security. We show that the FD AF relay channel can be seen as an intersymbol-interference (ISI) channel, hence, the discrete-Fourier transform (DFT) can be used for data modulation and demodulation to convert the frequency-selective channel into flat-fading channel per sub-channel/sub-carrier. By exploiting the fact that the channel memory needs to be cleared by inserting the cyclic-prefix, Alice injects an artificial-noise (AN) signal that hurts the eavesdropping nodes only. The strength of this AN signal and its interference rank are controlled by the relay{\textquoteright}s processing time.",

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AU - Marzban, Mohamed F.

AU - El Shafie, Ahmed

AU - Salem, Ahmed Sultan

AU - Al-Dhahir, Naofal

N1 - KAUST Repository Item: Exported on 2022-06-27

PY - 2022/3/31

Y1 - 2022/3/31

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AB - We investigate physical-layer security of the full-duplex (FD) amplify-and-forward (AF) relay channel. We provide a new perspective on the problem and show that the processing time (delay) at the relay can be exploited to improve the system’s security. We show that the FD AF relay channel can be seen as an intersymbol-interference (ISI) channel, hence, the discrete-Fourier transform (DFT) can be used for data modulation and demodulation to convert the frequency-selective channel into flat-fading channel per sub-channel/sub-carrier. By exploiting the fact that the channel memory needs to be cleared by inserting the cyclic-prefix, Alice injects an artificial-noise (AN) signal that hurts the eavesdropping nodes only. The strength of this AN signal and its interference rank are controlled by the relay’s processing time.

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JO - IEEE Transactions on Vehicular Technology

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Securing Full-Duplex Amplify-and-Forward Relay-Aided Communications Through Processing-Time Optimization

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