Tang, Boyi;
Xu, Hao;
Wong, Kai-Kit;
Tong, Kin-Fai;
Zhang, Yangyang;
Chae, Chan-Byoung;
(2023)
Fluid Antenna Enabling Secret Communications.
IEEE Communications Letters
10.1109/lcomm.2023.3264634.
(In press).
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Abstract
Recent researches have revealed that fluid antenna, a new position-switchable antenna technology, can make use of the spatial moments of deep fades of the interference signal occurred naturally due to multipath for multiple access. In this letter, this phenomenon is exploited in a physical layer security setup where a base station (BS) transmits an information-bearing signal to a legitimate user and an artificial noise (AN) signal to a potential eavesdropper while the user is equipped with a fluid antenna to overcome the AN signal. The proposed approach needs no effort from the base station (BS) to avoid the AN signal from harming the legitimate user. Trying to enhance the secrecy rate, we study the power allocation of the information-bearing and AN signals if the channel state information (CSI) is available at the BS. Both perfect and imperfect CSI scenarios are investigated. Simulation results demonstrate that the proposed system, with a single fluid antenna with one radio-frequency (RF) chain at the user, achieves the secrecy rate that is achievable by the user utilizing maximal ratio combining (MRC) with many antennas instead, and is the only approach robust to CSI uncertainties of the eavesdropper, requiring no power allocation nor beamforming at the BS.
| Type: | Article |
|---|---|
| Title: | Fluid Antenna Enabling Secret Communications |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1109/lcomm.2023.3264634 |
| Publisher version: | https://doi.org/10.1109/LCOMM.2023.3264634 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. - The work of Wong and Tong is supported by the Engineering and Physical Sciences Research Council (EPSRC) under Grant EP/W026813/1. For the purpose of open access, the authors will apply a Creative Commons Attribution (CC BY) licence to any Author Accepted Manuscript version arising. |
| Keywords: | Artificial noise, Fluid antenna system, Physical layer security, Power allocation, Secrecy rate |
| 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.ucl.ac.uk/id/eprint/10168162 |
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