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 journalArticlepeer-review

3 Scopus citations


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 languageEnglish (US)
Pages (from-to)6790-6794
Number of pages5
JournalIEEE Transactions on Vehicular Technology
Issue number6
StatePublished - Mar 31 2022
Externally publishedYes

Bibliographical note

KAUST Repository Item: Exported on 2022-06-27


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