TY - JOUR
T1 - Ergodic Secrecy Rate of RIS-Assisted Communication Systems in the Presence of Discrete Phase Shifts and Multiple Eavesdroppers
AU - Xu, Peng
AU - Chen, Gaojie
AU - Pan, Gaofeng
AU - Renzo, Marco Di
N1 - Publisher Copyright:
© 2012 IEEE.
PY - 2021/3
Y1 - 2021/3
N2 - 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 log 2 N for both non-colluding and colluding Eves. Numerical results are provided to verify the analytical results and the obtained scaling laws.
AB - 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 log 2 N for both non-colluding and colluding Eves. Numerical results are provided to verify the analytical results and the obtained scaling laws.
KW - Reconfigurable intelligent surface
KW - discrete phase shifts
KW - ergodic secrecy rate
KW - multiple eavesdroppers
UR - http://www.scopus.com/inward/record.url?scp=85097941547&partnerID=8YFLogxK
U2 - 10.1109/LWC.2020.3044178
DO - 10.1109/LWC.2020.3044178
M3 - Article
AN - SCOPUS:85097941547
SN - 2162-2337
VL - 10
SP - 629
EP - 633
JO - IEEE Wireless Communications Letters
JF - IEEE Wireless Communications Letters
IS - 3
M1 - 9291402
ER -