Multi-user interleaving physical-layer secure transmission in photonics-aided W-band fiber-wireless system enabled by...

Area of Science:

• Photonics
• Wireless Communication
• Information Security

Background:

• High-capacity and secure transmission is crucial for future photonics-aided millimeter-wave fiber-wireless systems.
• W-band links require broadband access and multi-user connectivity, necessitating enhanced physical layer security.

Purpose of the Study:

• To propose a photonics-aided W-band fiber-wireless scheme that enhances transmission security and system flexibility.
• To implement multidimensional interleaved encryption using chaotic models for secure data transmission.

Main Methods:

• Utilized digital frequency conversion to generate multiple sub-carriers for ciphertext and key transmission.
• Employed two chaotic models (4D and 2D) for encrypting user bit sequences and symbols.
• Integrated interleaving to further improve encryption randomness and security.

Main Results:

• Successfully demonstrated a 2 Gbaud 16QAM encrypted signal in a W-band fiber-wireless coherent transmission system.
• Achieved low bit error rates (BER) for Quadrature Phase Shift Keying (QPSK) and 16 Quadrature Amplitude Modulation (16QAM) encrypted signals.
• Demonstrated a large key space (10^112) and high BER (around 0.5) at illegal receivers, ensuring robust security.

Conclusions:

• The proposed scheme effectively supports multi-user transmission in W-band fiber-wireless systems.
• The multidimensional interleaved encryption ensures high information security at the physical layer.
• The scheme shows significant potential for future 6G wireless communication systems.