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Ergodic Secrecy Rate of RIS-Assisted Communication Systems in the Presence of Discrete Phase Shifts and Multiple Eavesdroppers

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journal contribution
posted on 2021-01-28, 09:24 authored by P Xu, G Chen, G Pan, M Di Renzo
This letter investigates the ergodic secrecy rate (ESR) of a reconfigurable intelligent surface (RIS)-assisted communication system in the presence multiple eavesdroppers (Eves), and by assuming discrete phase shifts at the RIS. In particular, a closed-form approximation of the ESR is derived for both non-colluding and colluding Eves. The analytical results are shown to be accurate when the number of reflecting elements of the RIS N is large. Asymptotic analysis is provided to investigate the impact of N on the ESR, and it is proved that the ESR scales with log2N for both non-colluding and colluding Eves. Numerical results are provided to verify the analytical results and the obtained scaling laws.

History

Author affiliation

School of Engineering

Version

  • AM (Accepted Manuscript)

Published in

IEEE Wireless Communications Letters

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

issn

2162-2337

eissn

2162-2345

Copyright date

2020

Available date

2020-12-11

Language

en

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