Secrecy Capacity Analysis and Beamforming Optimization for MIMO-VLC Wiretap Channels
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| _version_ | 1866915796539670528 |
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| author | Yang, Sufang Li, Longguang Wang, Jintao Li, Ya Xia, Liang He, Hongjun Wang, Qixing Liu, Guangyi |
| author_facet | Yang, Sufang Li, Longguang Wang, Jintao Li, Ya Xia, Liang He, Hongjun Wang, Qixing Liu, Guangyi |
| contents | This paper investigates a multiple-input multipleoutput (MIMO) visible light communication (VLC) wiretap channel consisting of a transmitter, a legitimate receiver, and an eavesdropper. The optical input is subject to both peakand average-intensity constraints. By applying the generalized entropy-power inequality to truncated exponential inputs, we derive a novel closed-form expression for the achievable secrecy rate for general MIMO VLC configurations. To enhance transmission confidentiality, a fully-connected beamforming scheme is proposed, along with a low-complexity sub-connected alternative. Although the resulting beamforming design problems are nonconvex, they are efficiently addressed by transforming them into a sequence of convex subproblems solvable via the successive convex approximation framework. Numerical results demonstrate that the proposed schemes achieve significant secrecy performance improvements compared with the benchmark scheme. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_12720 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Secrecy Capacity Analysis and Beamforming Optimization for MIMO-VLC Wiretap Channels Yang, Sufang Li, Longguang Wang, Jintao Li, Ya Xia, Liang He, Hongjun Wang, Qixing Liu, Guangyi Information Theory This paper investigates a multiple-input multipleoutput (MIMO) visible light communication (VLC) wiretap channel consisting of a transmitter, a legitimate receiver, and an eavesdropper. The optical input is subject to both peakand average-intensity constraints. By applying the generalized entropy-power inequality to truncated exponential inputs, we derive a novel closed-form expression for the achievable secrecy rate for general MIMO VLC configurations. To enhance transmission confidentiality, a fully-connected beamforming scheme is proposed, along with a low-complexity sub-connected alternative. Although the resulting beamforming design problems are nonconvex, they are efficiently addressed by transforming them into a sequence of convex subproblems solvable via the successive convex approximation framework. Numerical results demonstrate that the proposed schemes achieve significant secrecy performance improvements compared with the benchmark scheme. |
| title | Secrecy Capacity Analysis and Beamforming Optimization for MIMO-VLC Wiretap Channels |
| topic | Information Theory |
| url | https://arxiv.org/abs/2602.12720 |