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NOMA security scheme based on constellation camouflage and selective mapping.

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    This study introduces a secure non-orthogonal multiple access (NOMA) scheme using constellation camouflage and selective mapping. It achieves high-speed, secure data transmission in optical networks without signal damage.

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    Area of Science:

    • Optical Communications
    • Information Security
    • Signal Processing

    Background:

    • Non-orthogonal multiple access (NOMA) is crucial for future high-capacity optical networks.
    • Enhancing security in NOMA systems is essential to prevent eavesdropping and unauthorized access.
    • Existing security measures may increase complexity or degrade performance.

    Purpose of the Study:

    • To propose a novel security scheme for NOMA systems.
    • To enhance data security through constellation camouflage and selective mapping.
    • To maintain high transmission performance without increasing computational complexity.

    Main Methods:

    • Utilizing a four-dimensional chaos model for transmitter-side signal camouflage.
    • Transforming constellation diagrams from Binary Phase-Shift Keying (BPSK) to Quadrature Phase-Shift Keying (QPSK) and further to 16 points.
    • Implementing selective mapping for power multiplexing and region decision for demodulation.

    Main Results:

    • Experimental validation on a 2-km 7-core optical fiber.
    • Achieved secure transmission of a Power Division Multiplexing-Orthogonal Frequency-Division Multiplexing (PDM-OFDM) signal at 97.38 Gb/s net rate.
    • Demonstrated a maximum achievable key space of 10^135 without signal damage.

    Conclusions:

    • The proposed scheme offers a feasible and secure solution for NOMA-Passive Optical Networks (PONs).
    • Constellation camouflage effectively enhances system security.
    • Selective mapping and region decision maintain high transmission efficiency.