Author Identifier
Shihao Yan: https://orcid.org/0000-0002-4586-1926
Document Type
Journal Article
Publication Title
IEEE Transactions on Vehicular Technology
Publisher
IEEE
School
School of Science
Abstract
In this work, we consider a two-phase covert communication system assisted by a wireless powered jammer via a reconfigurable intelligent surface (RIS) with discrete phase shifts. Specifically, in the first phase, the jammer harvests energy from the same transmitter of covert signals with the aid of RIS and in the second phase the jammer uses all the harvested energy to generate interference for facilitating covert transmissions. We first derive the minimum detection error probability at a warden, based on which we optimize the phase switching ratio between the two phases to maximize the effective transmission rate subject to a covertness constraint. Interestingly, our analysis indicates that the achievable communication covertness does not depend on the transmit power of Alice, which remains the same across the two phases for simplifying system implementation. Our examinations also show that a shorter duration should be allocated to energy harvesting for maximizing the covert communication performance when the capability of the RIS increases, e.g., the element number or discrete phase shift level increases.
DOI
10.1109/TVT.2025.3562850
Creative Commons License
This work is licensed under a Creative Commons Attribution-No Derivative Works 4.0 License.
Comments
This is an an Author's Accepted Manuscript of an article published by IEEE. © 2025 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Zhang, D., Zhang, J., Yuan, Q., Sun, J., & Yan, S. (2025). Two-phase covert communication with a wireless-powered jammer by RIS. IEEE Transactions on Vehicular Technology. Advance online publication. https://doi.org/10.1109/TVT.2025.3562850