Fluid antennas improve wireless security even near eavesdroppers
Fluid Antenna Secure Channel-driven Constellation (FASCC): a Physical Layer Security approach
Information Theory
Summary
Wireless communications can be intercepted by unwanted listeners, making it hard to keep information safe. The authors introduce a way to use fluid antennas, which can change their position, to create secret signals based on how the antenna connects to the channel. This approach helps improve the security of messages even if an eavesdropper is physically closer to the transmitter than the intended receiver. They tested two versions of this method depending on whether the eavesdropper’s channel information is known or not. Their results show that this new technique can reduce errors and keep information more secure.
What this means in practice
- •For wireless network engineers: Create more secure wireless links by exploiting fluid antenna port selection and phase control to reduce interception chances even near attackers.
- •For mobile device developers: Implement physical layer security features using fluid antenna technology to enhance user data privacy in cellular downlink systems.
Authors
Daniel Dinis, Risto Wichman
Abstract
Fluid antenna systems (FAS) have recently emerged as a promising technology for future wireless networks due to their ability to access a large number of channel realizations using a single radio-frequency chain. This capability creates new opportunities for physical-layer security beyond conventional beamforming and artificial-noise approaches. In this paper, we propose a novel Fluid Antenna Secure Channel-driven Constellation (FASCC) framework for downlink communications, in which information is conveyed through channel-domain constellation points generated by FAS port selection and phase adaptation. Two complementary FASCC schemes are developed, depending on the availability of eavesdropper's channel state information. Numerical results demonstrate that the proposed FASCC framework achieves significant secrecy gains in terms of bit error rate and mutual-information secrecy performance, even when Eve is significantly closer to the base station than Bob.