Dual chaotic encryption scheme for index modulation orthogonal time frequency space PON system.

Area of Science:

• Optical communication systems
• Signal processing
• Information security

Background:

• Orthogonal Time Frequency Space-Index Modulation (OTFS-IM) systems face challenges in physical layer security (PLS) and peak-to-average power ratio (PAPR).
• Efficient and secure data transmission is crucial for modern communication networks, including passive optical networks (PONs).

Purpose of the Study:

• To propose a novel dual chaotic encryption method combined with a PAPR-optimized encryption scheme for OTFS-IM systems.
• To enhance the physical layer security and transmission efficiency of OTFS-IM PON systems.
• To evaluate the performance improvements in PAPR and inter-carrier interference (ICI).

Main Methods:

• Dual chaotic encryption applied to index and data bits of OTFS-IM.
• Random Interleaved Partitioning Time Segmentation (RIPTS) for PAPR optimization and autocorrelation reduction.
• System verification through Back-to-back (B2B) and 80 km standard single-mode fiber (SSMF) transmission in a PON setup.

Main Results:

• The RIPTS scheme improved PAPR performance by 4.3 dB compared to non-optimized OTFS-IM.
• RIPTS outperformed existing schemes (PTS, IPTS, RPTS) by 0.8 dB, 0.6 dB, and 0.5 dB respectively, while reducing ICI.
• The dual chaotic encryption offers a large key space of up to 10^90, ensuring robust security.

Conclusions:

• The proposed dual chaotic encryption and RIPTS scheme provide an effective solution for the PLS challenges in OTFS-IM PON systems.
• The integrated approach significantly optimizes system transmission performance by improving PAPR and security.
• This research contributes to the development of more secure and efficient optical communication technologies.