Abstract
In this letter, a reconfigurable intelligent surface (RIS)-based passive covert communication scheme is proposed, where source node Alice covertly transmits information to receiver Bob by using a RIS and reflecting the incident signals from an ambient radio frequency source. The key idea is to adjust the phase shifts of the RIS to align the phases of the received reflected signals at Bob and meanwhile to adjust the reflection amplitude to satisfy the covert constraint. The detection error probability at warden Willie and the decoding error probability at Bob in Rayleigh fading channels are derived analytically. It is shown that the proposed scheme can enhance transmission reliability while satisfying the covert constraint by increasing RIS’s elements.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
