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.
Citation:
Wijewardena, M., Samarasinghe, T., Hemachandra, K. T., Atapattu, S., & Evans, J. S. (2021). Physical Layer Security for Intelligent Reflecting Surface Assisted Two–Way Communications. IEEE Communications Letters, 25(7), 2156–2160. https://doi.org/10.1109/LCOMM.2021.3068102
