High-security SCMA-OFDM multi-core fiber transmission system based on a regular hexagon chaotic codebook

Area of Science:

• Optical Communications
• Information Security
• Signal Processing

Background:

• Sparse Code Multiple Access (SCMA) is a non-orthogonal technology in 5G communication.
• Orthogonal Frequency Division Multiplexing (OFDM) can enhance link quality for single users.
• Passive Optical Networks (PONs) require advanced security and performance for next-generation applications.

Purpose of the Study:

• To propose a high-security SCMA-OFDM multi-core fiber transmission system for next-generation PONs.
• To design a novel regular hexagonal chaotic codebook for enhanced encryption and performance.
• To analyze the security, reliability, and performance of the proposed system.

Main Methods:

• Design of a regular hexagonal chaotic codebook using a four-dimensional Rossler chaos model to optimize constellation points.
• Implementation of frequency domain block scrambling for encryption.
• Conducting 42 Gb/s encrypted data transmission experiments over a 2km multi-core fiber link.

Main Results:

• The proposed system achieved a key space of 10^178, ensuring high security.
• A 2.5 dB performance improvement was observed compared to traditional codebooks at a Bit Error Rate (BER) of 1x10^-3.
• The system demonstrated reliable encrypted data transmission at 42 Gb/s.

Conclusions:

• The regular hexagonal chaotic codebook effectively balances codebook disturbance and BER, enhancing transmission performance.
• The SCMA-OFDM multi-core fiber system offers a secure and reliable solution for next-generation PONs.
• Further analysis of SCMA-OFDM architecture and multi-user detection algorithms is beneficial.