Near-Field Secure Beamfocusing With Receiver-Centered Protected Zone
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arXiv
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| Autori principali: | , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866908655235891200 |
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| author | Liu, Cen Zhou, Xiangyun Yang, Nan Durrani, Salman Swindlehurst, A. Lee |
| author_facet | Liu, Cen Zhou, Xiangyun Yang, Nan Durrani, Salman Swindlehurst, A. Lee |
| contents | This work studies near-field secure communications through transmit beamfocusing. We examine the benefit of having a protected eavesdropper-free zone around the legitimate receiver, and we determine the worst-case secrecy performance against a potential eavesdropper located anywhere outside the protected zone. A max-min optimization problem is formulated for the beamfocusing design with and without artificial noise transmission. Despite the NP-hardness of the problem, we develop a synchronous gradient descent-ascent framework that approximates the global maximin solution. A low-complexity solution is also derived that delivers excellent performance over a wide range of operating conditions. We further extend this study to a scenario where it is not possible to physically enforce a protected zone. To this end, we consider secure communications through the creation of a virtual protected zone using a full-duplex legitimate receiver. Numerical results demonstrate that exploiting either the physical or virtual receiver-centered protected zone with appropriately designed beamfocusing is an effective strategy for achieving secure near-field communications. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_19523 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Near-Field Secure Beamfocusing With Receiver-Centered Protected Zone Liu, Cen Zhou, Xiangyun Yang, Nan Durrani, Salman Swindlehurst, A. Lee Signal Processing Information Theory This work studies near-field secure communications through transmit beamfocusing. We examine the benefit of having a protected eavesdropper-free zone around the legitimate receiver, and we determine the worst-case secrecy performance against a potential eavesdropper located anywhere outside the protected zone. A max-min optimization problem is formulated for the beamfocusing design with and without artificial noise transmission. Despite the NP-hardness of the problem, we develop a synchronous gradient descent-ascent framework that approximates the global maximin solution. A low-complexity solution is also derived that delivers excellent performance over a wide range of operating conditions. We further extend this study to a scenario where it is not possible to physically enforce a protected zone. To this end, we consider secure communications through the creation of a virtual protected zone using a full-duplex legitimate receiver. Numerical results demonstrate that exploiting either the physical or virtual receiver-centered protected zone with appropriately designed beamfocusing is an effective strategy for achieving secure near-field communications. |
| title | Near-Field Secure Beamfocusing With Receiver-Centered Protected Zone |
| topic | Signal Processing Information Theory |
| url | https://arxiv.org/abs/2505.19523 |