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

Shiyu Deng, Yaya Mao, Jianxin Ren

|June 11, 2024

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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.

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Last Updated: Jun 24, 2025

Quasi-light Storage for Optical Data Packets

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Published on: February 6, 2014

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Published on: March 20, 2017

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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.