Physical Layer Security for Intelligent Reflecting Surface Assisted Two–Way Communications
Mevan Wijewardena, Tharaka Samarasinghe, Kasun T. Hemachandra, Saman Atapattu, Jamie Evans
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.
Topics & Concepts
Computer scienceSecrecyPhysical layerIterative methodComputer networkAlgorithmTelecommunicationsWirelessComputer securityAdvanced Wireless Communication TechnologiesOcular Disorders and TreatmentsOcular Oncology and Treatments