Coding-aware secure beamforming in cell-free networks
(2024) IEEE 25th International Workshop on Signal Processing Advances in Wireless Communications (SPAWC) — Location: Lucca (Italy) (10.September.2024)
Files
Coding-awaresecurebeamformingincell-freenetworks.pdf
Open Access - Adobe PDF
- 360.1 KB
Details
- Authors
- Abstract
- Secure beamforming methods scale difficulty with the number of eavesdroppers and transmitters, as traditional security requires each transmitter-eavesdropper link to be secure. When messages are linearly coded together prior to the transmission, the communications are secure even if the eavesdropper receives all but one of the packets. As this fundamentally changes the way beamforming should be performed, this paper studies the coding-aware beamforming design in cell-free networks, with several transmitters, receivers, and eavesdroppers. A nonconvex optimisation problem is formulated, which minimises the information leakage towards any eavesdropper while ensuring the receivers have a sufficient signal-to-interference-plus-noise ratio. A local optimum of this problem is obtained through alternating minimisation. The sub-problems which must be solved by the transmitters are shown to be convex, and they are tackled through conic optimisation. Numerical validations are performed, showing that secure communications are possible even when there are many eavesdroppers, and when some of them are located between the receivers and one of the transmitters. Trade-offs between security, rate, and the closeness of the eavesdroppers are moreover studied, demonstrating the improvements brought by the coding-aware beamformers.
- Affiliations
Citations
Thiran, G., & Vandendorpe, L. (2024). Coding-aware secure beamforming in cell-free networks. IEEE Workshop on Signal Processing Advances in Wireless Communications. Proceedings, 2024, 481-485. https://doi.org/10.1109/SPAWC60668.2024.10694047 (Original work published 2024)