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

doi:10.1109/TVT.2022.3163376

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

2022-06-01

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DOI：10.1109/TVT.2022.3163376

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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.

Keywords:

Relays

Security

Receivers

Interference cancellation

Delays

Wireless communication

Communication system security

Full-duplex

physical-layer security

relay communi cations

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

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