Physical layer security for intelligent reflecting surface assisted two–way communications
Published in IEEE communications letters, 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.
Recommended citation: M. Wijewardena, T. Samarasinghe, K. T. Hemachandra, S. Atapattu and J. S. Evans, "Physical Layer Security for Intelligent Reflecting Surface Assisted Two–Way Communications," in IEEE Communications Letters, vol. 25, no. 7, pp. 2156-2160, July 2021, doi: 10.1109/LCOMM.2021.3068102.
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