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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 28.01.2021, 09:24 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

11/12/2020

Language

en