Secure high-density constellation mapping OTFS modulation scheme with low PAPR

Shiyu Deng , Yaya Mao , Jianxin Ren

Optics Express +

|

June 11, 2024

View abstract on PubMed

Summary

A new secure Orthogonal Time-Frequency Space (OTFS) modulation system uses 3D Dense Constellation Mapping (DCM) and a Selective Reduction Amplitude (SRA) algorithm. This combination improves receiver sensitivity and reduces signal power issues for faster data processing.

Area Of Science

Optical Communications
Signal Processing
Modulation Techniques

Background

Orthogonal Time-Frequency Space (OTFS) modulation offers advantages in high-Doppler environments.
Dense Constellation Mapping (DCM) geometric shaping improves spectral efficiency.
High Peak-to-Average Power Ratio (PAPR) is a challenge in optical transmission systems.

Purpose Of The Study

To propose a secure OTFS modulation system using 3D DCM geometric shaping.
To introduce a Selective Reduction Amplitude (SRA) algorithm for PAPR reduction in DCM-based OTFS.
To evaluate the system's performance in a practical optical fiber transmission scenario.

Main Methods

Developed a 3D DCM based on regular tetrahedron construction for enhanced space utilization.
Implemented an SRA algorithm to reduce transmitter's high PAPR, with minimal capacity overhead (0.57%).
Verified performance through a 2 km, 7-core optical fiber transmission experiment at 33.93 Gb/s.

Main Results

Achieved optical transmission at 33.93 Gb/s.
SRA reduced OTFS system PAPR by over 2.2 dB.
OTFS with DCM and SRA improved receiver sensitivity by 3.7 dB (vs. OTFS with concentric cube mapping and SRA) and 2.7 dB (vs. OFDM with DCM) at a BER threshold of 3.8×10⁻³.
Demonstrated full recovery of SRA valid data near the BER threshold.

Conclusions

The proposed secure OTFS system with 3D DCM and SRA effectively reduces PAPR while maintaining bit error rate performance.
The SRA algorithm is efficient, requiring minimal transmission capacity.
The system demonstrates significant improvements in receiver sensitivity, making it suitable for high-speed optical data transmission.