Journal article

Physical Layer Security for Intelligent Reflecting Surface Assisted Two-Way Communications

Mevan Wijewardena, Tharaka Samarasinghe, Kasun T Hemachandra, Saman Atapattu, Jamie S Evans

IEEE COMMUNICATIONS LETTERS | IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC | Published : 2021

Abstract

This letter investigates the exploitation of an intelligent reflecting surface (IRS) to communicate securely in a two-way network consisting of an untrusted user. In particular, the transmit powers and the phase shift at each element of the IRS are optimized to maximize the sum-secrecy rate, such that the IRS-reflected and non-IRS-reflected signals are added destructively at the untrusted user. The proposed iterative algorithm converges rapidly to a feasible solution of high accuracy with a few iterations. Numerical results demonstrate sum-secrecy rate gains up to 120% compared to naive or partially optimized schemes.

Grants

Awarded by Australian Research Council (ARC)


Funding Acknowledgements

This work was supported in part by the Australian Research Council (ARC) through the Discovery Project (DP) under Grant DP180101205.