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Transmission lines are essential components of electrical power systems. They are characterized by the distributed nature of resistance (R), inductance (L), and capacitance (C) per unit length. To analyze these lines, differential equations are employed to model the variations in voltage and current along the line.
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Enhanced secure encryption scheme using dual chaotic models for OFDM-VLC system with HD-MMIM.

Zhixin Qi, Jie Ma, Jia Lu

    Optics Express
    |August 13, 2025
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    Summary
    This summary is machine-generated.

    This study introduces a secure communication method for visible light systems using high-dimensional multi-mode index modulation. The novel approach enhances security and transmission performance, offering robust protection against unauthorized access.

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    Area of Science:

    • Wireless Communication
    • Optical Communication
    • Information Security

    Background:

    • Visible light communication (VLC) offers high bandwidth and security potential.
    • Orthogonal frequency division multiplexing (OFDM) is a key technology in modern VLC systems.
    • Physical-layer security is crucial for protecting sensitive data in wireless networks.

    Purpose of the Study:

    • To propose a novel physical-layer security-enhanced scheme for OFDM-VLC systems.
    • To integrate chaos models for a multi-level dynamic protection framework.
    • To improve the transmission performance and security of VLC systems.

    Main Methods:

    • Implementation of a high-dimensional multi-mode index modulation (HD-MMIM) scheme.
    • Integration of 1D Logistic chaos and 4D hyperchaotic models.
    • Development of a multi-level encryption framework: bit stream XOR, index table encryption, and HD constellation rotation.

    Main Results:

    • The 6D-MMIM scheme demonstrated improved Q-factor by 0.63 dB and 1.12 dB compared to 4D-MMIM and 5D-MMIM.
    • Optimal bias current range for 6D-MMIM was extended by 29.38 mA and 19.15 mA, respectively.
    • The encryption scheme offers a key space of 10^198, effectively resisting brute-force attacks.

    Conclusions:

    • The proposed HD-MMIM scheme significantly enhances the security and transmission performance of OFDM-VLC systems.
    • The multi-level encryption framework provides robust protection against unauthorized access.
    • This innovative approach contributes to the development of secure and efficient visible light communication technologies.