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Polar coded SCMA-OCDM based on chaotic scrambled SLM.

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    Area of Science:

    • Optical communication networks
    • Signal processing
    • Information theory

    Background:

    • Passive Optical Networks (PONs) require advanced modulation and coding schemes for higher data rates and improved performance.
    • Orthogonal Frequency Division Multiplexing (OFDM) is widely used but faces limitations in spectral efficiency and anti-interference capabilities.
    • Sparse Code Multiple Access (SCMA) offers improved spectral efficiency and multi-user access capabilities.

    Purpose of the Study:

    • To propose and evaluate a novel polar coded SCMA scheme combined with Orthogonal Chirp Division Multiplexing (OCDM) and Chaotic Scrambled Selective Mapping (CS_SLM) for future PONs.
    • To enhance the reliability, security, and spectral efficiency of PON systems.
    • To improve Bit Error Rate (BER) performance through joint iterative detection and decoding.

    Main Methods:

    • Polar coding for error correction.
    • SCMA for multi-user access and spectral efficiency.
    • Orthogonal Chirp Division Multiplexing (OCDM) for enhanced anti-interference.
    • Chaotic Scrambled Selective Mapping (CS_SLM) for improved reliability and security.
    • Joint iterative detection and decoding at the receiver.

    Main Results:

    • Demonstrated a 49.42 Gb/s polar coded SCMA-OCDM PON over 2 km of seven-core fiber.
    • Achieved a receiver sensitivity of 0.8 dB at a BER of 3.8 × 10-3 compared to SCMA-OFDM.
    • Obtained a 2.08 dB receiver sensitivity gain over the clipping and filtering (CAF) method for CS_SLM at BER < 10-5 due to reduced Peak to Average Power Ratio (PAPR).

    Conclusions:

    • The proposed polar coded SCMA-OCDM scheme with CS_SLM is a promising candidate for next-generation PONs.
    • The integration of polar coding, SCMA, OCDM, and CS_SLM significantly enhances system performance, including BER, reliability, and security.
    • The scheme effectively addresses the security concerns in PON downlink broadcasting.