Yao, J;
Xin, L;
Wu, T;
Jin, M;
Wong, KK;
Yuen, C;
Shin, H;
(2025)
FAS for Secure and Covert Communications.
IEEE Internet of Things Journal
10.1109/JIOT.2025.3539737.
(In press).
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Abstract
This letter considers a fluid antenna system (FAS)-aided secure and covert communication system, where the transmitter adjusts multiple fluid antennas' positions to achieve secure and covert transmission under the threat of an eavesdropper and the detection of a warden. This letter aims to maximize the secrecy rate while satisfying the covertness constraint. Unfortunately, the optimization problem is non-convex due to the coupled variables. To tackle this, we propose an alternating optimization (AO) algorithm to alternatively optimize the optimization variables in an iterative manner. In particular, we use a penalty-based method and the majorization-minimization (MM) algorithm to optimize the transmit beamforming and fluid antennas' positions, respectively. Simulation results show that FAS can significantly improve the performance of secrecy and covertness compared to the fixed-position antenna (FPA)-based schemes.
| Type: | Article |
|---|---|
| Title: | FAS for Secure and Covert Communications |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/JIOT.2025.3539737 |
| Publisher version: | https://doi.org/10.1109/jiot.2025.3539737 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | Alternating optimization (AO), covert communication, fluid antenna system (FAS), secrecy |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10206685 |
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