Tertiary-Mode STAR-RIS for Secure NOMA: Integrating Transmission, Reflection, and Jamming
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arXiv
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| Hauptverfasser: | , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866911551390220288 |
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| author | Nema, Mansi Deka, Kuntal Sharma, Sanjeev Ratnarajah, Tharmalingam |
| author_facet | Nema, Mansi Deka, Kuntal Sharma, Sanjeev Ratnarajah, Tharmalingam |
| contents | This paper investigates the physical layer security of a non-orthogonal multiple access (NOMA) system assisted by a tertiary-mode simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS), which can perform transmission, reflection, and jamming simultaneously. The system comprises a base station (BS) serving two users located on opposite sides of the STAR-RIS, assuming perfect channel state information (CSI) at the transmitter. To enhance secrecy performance, a subset of STAR-RIS elements is adaptively configured for jamming. A penalty-based alternating optimization algorithm is developed to jointly optimize the BS's active beamforming and the STAR-RIS's passive beamforming and mode selection. Simulation results demonstrate that the proposed design substantially improves the achievable sum rate and secrecy performance compared to conventional RIS-assisted and no-RIS benchmarks, highlighting the potential of tertiary-mode STAR-RIS for secure and efficient next-generation wireless communications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_27722 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Tertiary-Mode STAR-RIS for Secure NOMA: Integrating Transmission, Reflection, and Jamming Nema, Mansi Deka, Kuntal Sharma, Sanjeev Ratnarajah, Tharmalingam Signal Processing This paper investigates the physical layer security of a non-orthogonal multiple access (NOMA) system assisted by a tertiary-mode simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS), which can perform transmission, reflection, and jamming simultaneously. The system comprises a base station (BS) serving two users located on opposite sides of the STAR-RIS, assuming perfect channel state information (CSI) at the transmitter. To enhance secrecy performance, a subset of STAR-RIS elements is adaptively configured for jamming. A penalty-based alternating optimization algorithm is developed to jointly optimize the BS's active beamforming and the STAR-RIS's passive beamforming and mode selection. Simulation results demonstrate that the proposed design substantially improves the achievable sum rate and secrecy performance compared to conventional RIS-assisted and no-RIS benchmarks, highlighting the potential of tertiary-mode STAR-RIS for secure and efficient next-generation wireless communications. |
| title | Tertiary-Mode STAR-RIS for Secure NOMA: Integrating Transmission, Reflection, and Jamming |
| topic | Signal Processing |
| url | https://arxiv.org/abs/2603.27722 |