Multi-Functional Reconfigurable Intelligent Surface Assisted Security Communication Systems Under Imperfect CSI of Eavesdroppers
In order to overcome the “multiplicative fading” loss and half-space coverage limitations faced by reconfigurable intelligent surfaces (RIS) in secure communications, a more practical multi-functional reconfigurable intelligent surface (MF-RIS) with coupled phase shifts is intr...
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IEEE
2025-01-01
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| Series: | IEEE Access |
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| Online Access: | https://ieeexplore.ieee.org/document/10843222/ |
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| author | Rui-Bao Zhang Dian-Wu Yue Yu Sun |
| author_facet | Rui-Bao Zhang Dian-Wu Yue Yu Sun |
| author_sort | Rui-Bao Zhang |
| collection | DOAJ |
| description | In order to overcome the “multiplicative fading” loss and half-space coverage limitations faced by reconfigurable intelligent surfaces (RIS) in secure communications, a more practical multi-functional reconfigurable intelligent surface (MF-RIS) with coupled phase shifts is introduced to assist in enhancing the security performance of multiple-input single-output (MISO) systems. In addition, the paper especially focuses on the case where the eavesdropper’s channel state information (CSI) is imperfect. Based on the bounded CSI error model, this paper strictly limits the upper bound of information leakage to potential eavesdroppers and seeks to maximize the system sum rate by jointly optimizing the beamforming at the transmitter side and the coupled phase shifts of the MF-RIS. For this nonconvex optimization problem, we combine the penalty dual decomposition method, weighted minimum mean square error (WMMSE) method, S-Procedure Lemma, and general sign-definiteness to design an efficient solution. Simulation results show that: 1) All MF-RIS schemes achieve better secrecy performance gains than other existing RIS designs; and 2) Compared to the optimal independent phase shifts, coupled phase shifts of MF-RIS only lead to a slight performance loss. |
| format | Article |
| id | doaj-art-9255300d983548658cb5f4212fd50fc7 |
| institution | Kabale University |
| issn | 2169-3536 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Access |
| spelling | doaj-art-9255300d983548658cb5f4212fd50fc72025-01-25T00:00:43ZengIEEEIEEE Access2169-35362025-01-0113145311454110.1109/ACCESS.2025.352993210843222Multi-Functional Reconfigurable Intelligent Surface Assisted Security Communication Systems Under Imperfect CSI of EavesdroppersRui-Bao Zhang0Dian-Wu Yue1https://orcid.org/0000-0001-9866-0194Yu Sun2https://orcid.org/0009-0003-5040-5487College of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, ChinaCollege of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, ChinaCollege of Information Science and Technology, Dalian Maritime University, Dalian, Liaoning, ChinaIn order to overcome the “multiplicative fading” loss and half-space coverage limitations faced by reconfigurable intelligent surfaces (RIS) in secure communications, a more practical multi-functional reconfigurable intelligent surface (MF-RIS) with coupled phase shifts is introduced to assist in enhancing the security performance of multiple-input single-output (MISO) systems. In addition, the paper especially focuses on the case where the eavesdropper’s channel state information (CSI) is imperfect. Based on the bounded CSI error model, this paper strictly limits the upper bound of information leakage to potential eavesdroppers and seeks to maximize the system sum rate by jointly optimizing the beamforming at the transmitter side and the coupled phase shifts of the MF-RIS. For this nonconvex optimization problem, we combine the penalty dual decomposition method, weighted minimum mean square error (WMMSE) method, S-Procedure Lemma, and general sign-definiteness to design an efficient solution. Simulation results show that: 1) All MF-RIS schemes achieve better secrecy performance gains than other existing RIS designs; and 2) Compared to the optimal independent phase shifts, coupled phase shifts of MF-RIS only lead to a slight performance loss.https://ieeexplore.ieee.org/document/10843222/Physical layer securitymulti-functional reconfigurable intelligent surfacecoupled phase shiftsimperfect channel state information |
| spellingShingle | Rui-Bao Zhang Dian-Wu Yue Yu Sun Multi-Functional Reconfigurable Intelligent Surface Assisted Security Communication Systems Under Imperfect CSI of Eavesdroppers IEEE Access Physical layer security multi-functional reconfigurable intelligent surface coupled phase shifts imperfect channel state information |
| title | Multi-Functional Reconfigurable Intelligent Surface Assisted Security Communication Systems Under Imperfect CSI of Eavesdroppers |
| title_full | Multi-Functional Reconfigurable Intelligent Surface Assisted Security Communication Systems Under Imperfect CSI of Eavesdroppers |
| title_fullStr | Multi-Functional Reconfigurable Intelligent Surface Assisted Security Communication Systems Under Imperfect CSI of Eavesdroppers |
| title_full_unstemmed | Multi-Functional Reconfigurable Intelligent Surface Assisted Security Communication Systems Under Imperfect CSI of Eavesdroppers |
| title_short | Multi-Functional Reconfigurable Intelligent Surface Assisted Security Communication Systems Under Imperfect CSI of Eavesdroppers |
| title_sort | multi functional reconfigurable intelligent surface assisted security communication systems under imperfect csi of eavesdroppers |
| topic | Physical layer security multi-functional reconfigurable intelligent surface coupled phase shifts imperfect channel state information |
| url | https://ieeexplore.ieee.org/document/10843222/ |
| work_keys_str_mv | AT ruibaozhang multifunctionalreconfigurableintelligentsurfaceassistedsecuritycommunicationsystemsunderimperfectcsiofeavesdroppers AT dianwuyue multifunctionalreconfigurableintelligentsurfaceassistedsecuritycommunicationsystemsunderimperfectcsiofeavesdroppers AT yusun multifunctionalreconfigurableintelligentsurfaceassistedsecuritycommunicationsystemsunderimperfectcsiofeavesdroppers |