Secrecy-rate optimization of double RIS-aided space-ground networks
Secrecy-rate optimization of double RIS-aided space-ground networks
The physical-layer security (PLS) of a space-ground communication system is examined. To improve the security performance, a pair of reconfigurable intelligent surfaces (RISs) is integrated into the system and benchmarked against a scheme, where there is only a single RIS close to the ground station. As for the double-RIS scenario, we formulate a secrecy rate maximization problem, and then propose an alternating optimization (AO) algorithm for jointly optimizing three vectors, namely, the beamformer of the ground station and the reflecting vectors of two different RISs. Similarly, as for the single-RIS case, we also propose another AO algorithm for optimizing a pair of vectors, namely, the beamformer of the ground station and the reflecting vector of the single RIS. Both the double-RIS and the single-RIS AO algorithms are developed on the basis of the first-order Taylor expansion and Dinkelbach's method, which allow us to approximate nonconvex optimization problems by convex ones. Our results demonstrate that the proposed double-RIS scheme outperforms the single-RIS benchmark scheme in terms of its security.
Benchmark testing, Correlation, Internet of Things, Optimization, Physical layer security, Satellites, Security, Wireless communication, alternating optimization, reconfigurable intelligent surface, space-ground network, physical-layer security (PLS), Alternating optimization (AO), reconfigurable intelligent surface (RIS)
13221-13234
Hoang, Minh tiep T
79ed4c0b-02ee-420a-a4cf-eeb0c2715d76
Xu, Chao
5710a067-6320-4f5a-8689-7881f6c46252
Vahid, Alireza
ce5dfdef-a332-45e9-85f3-03724752f489
Tuan, Hoang Duong
423ee18d-ebc7-44d9-9264-3819b63779eb
Duong, Trung Q.
406d80a2-b57f-4955-85aa-c5bc5a236b04
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
1 August 2023
Hoang, Minh tiep T
79ed4c0b-02ee-420a-a4cf-eeb0c2715d76
Xu, Chao
5710a067-6320-4f5a-8689-7881f6c46252
Vahid, Alireza
ce5dfdef-a332-45e9-85f3-03724752f489
Tuan, Hoang Duong
423ee18d-ebc7-44d9-9264-3819b63779eb
Duong, Trung Q.
406d80a2-b57f-4955-85aa-c5bc5a236b04
Hanzo, Lajos
66e7266f-3066-4fc0-8391-e000acce71a1
Hoang, Minh tiep T, Xu, Chao, Vahid, Alireza, Tuan, Hoang Duong, Duong, Trung Q. and Hanzo, Lajos
(2023)
Secrecy-rate optimization of double RIS-aided space-ground networks.
IEEE Internet of Things Journal, 10 (15), .
(doi:10.1109/JIOT.2023.3262481).
Abstract
The physical-layer security (PLS) of a space-ground communication system is examined. To improve the security performance, a pair of reconfigurable intelligent surfaces (RISs) is integrated into the system and benchmarked against a scheme, where there is only a single RIS close to the ground station. As for the double-RIS scenario, we formulate a secrecy rate maximization problem, and then propose an alternating optimization (AO) algorithm for jointly optimizing three vectors, namely, the beamformer of the ground station and the reflecting vectors of two different RISs. Similarly, as for the single-RIS case, we also propose another AO algorithm for optimizing a pair of vectors, namely, the beamformer of the ground station and the reflecting vector of the single RIS. Both the double-RIS and the single-RIS AO algorithms are developed on the basis of the first-order Taylor expansion and Dinkelbach's method, which allow us to approximate nonconvex optimization problems by convex ones. Our results demonstrate that the proposed double-RIS scheme outperforms the single-RIS benchmark scheme in terms of its security.
Text
final-6
- Accepted Manuscript
More information
Accepted/In Press date: 24 March 2023
Published date: 1 August 2023
Additional Information:
Publisher Copyright:
© 2014 IEEE.
Keywords:
Benchmark testing, Correlation, Internet of Things, Optimization, Physical layer security, Satellites, Security, Wireless communication, alternating optimization, reconfigurable intelligent surface, space-ground network, physical-layer security (PLS), Alternating optimization (AO), reconfigurable intelligent surface (RIS)
Identifiers
Local EPrints ID: 476425
URI: http://eprints.soton.ac.uk/id/eprint/476425
ISSN: 2327-4662
PURE UUID: 98dd09de-d232-458a-bcf0-68e89c33f5cb
Catalogue record
Date deposited: 21 Apr 2023 11:59
Last modified: 18 Mar 2024 03:17
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Contributors
Author:
Minh tiep T Hoang
Author:
Chao Xu
Author:
Alireza Vahid
Author:
Hoang Duong Tuan
Author:
Trung Q. Duong
Author:
Lajos Hanzo
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