Xiao, Han;
Hu, Xiaoyan;
Zheng, Tong-Xing;
Wong, Kai-Kit;
(2023)
STAR-RIS Assisted Covert Communications in NOMA Systems.
IEEE Transactions on Vehicular Technology
pp. 1-6.
10.1109/TVT.2023.3329873.
(In press).
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Abstract
Covert communications assisted by simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) in non-orthogonal multiple access (NOMA) systems have been explored in this paper. In particular, the access point (AP) transmitter adopts NOMA to serve a down-link covert user and a public user. The minimum detection error probability (DEP) at the warden is derived considering the uncertainty of its background noise, which is used as a covertness constraint. We aim at maximizing the covert rate of the system by jointly optimizing AP's transmit power and passive beamforming of STAR-RIS, under the covertness and quality of service (QoS) constraints. An iterative algorithm is proposed to effectively solve the non-convex optimization problem. Simulation results show that the proposed scheme significantly outperforms the conventional RIS-based scheme in ensuring system covert performance.
| Type: | Article |
|---|---|
| Title: | STAR-RIS Assisted Covert Communications in NOMA Systems |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/TVT.2023.3329873 |
| Publisher version: | http://dx.doi.org/10.1109/tvt.2023.3329873 |
| 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: | Covert communications, STAR-RIS, NOMA |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Electronic and Electrical Eng |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10185516 |
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