RIS-assisted Physical Layer Security

Xudong Li; Matthias Frey; Ehsan Tohidi; Igor Bjelaković; Sławomir Stańczak

RIS-assisted Physical Layer Security

Information Theory 2025-01-31 v1 Signal Processing math.IT

Authors: Xudong Li , Matthias Frey , Ehsan Tohidi , Igor Bjelaković , Sławomir Stańczak

Abstract

We propose a reconfigurable intelligent surface (RIS)-assisted wiretap channel, where the RIS is strategically deployed to provide a spatial separation to the transmitter, and orthogonal combiners are employed at the legitimate receiver to extract the data streams from the direct and RIS-assisted links. Then we derive the achievable secrecy rate under semantic security for the RIS-assisted channel and design an algorithm for the secrecy rate optimization problem. The simulation results show the effects of total transmit power, the location and number of eavesdroppers on the security performance.

Keywords

reconfigurable intelligent surface physical layer security wiretap channel

Cite

@article{arxiv.2501.18236,
  title  = {RIS-assisted Physical Layer Security},
  author = {Xudong Li and Matthias Frey and Ehsan Tohidi and Igor Bjelaković and Sławomir Stańczak},
  journal= {arXiv preprint arXiv:2501.18236},
  year   = {2025}
}

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