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Updated: Sep 11, 2025

A Photonic System for Generating Unconditional Polarization-Entangled Photons Based on Multiple Quantum Interference
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Improving Data Communication of Enhanced Loran Systems Using 128-ary Polar Codes.

Ruochen Jia1, Yunxiao Li1, Daiming Qu1

  • 1School of Electronic Information and Communications, Huazhong University of Science and Technology, Wuhan 430074, China.

Sensors (Basel, Switzerland)
|August 14, 2025
PubMed
Summary

Enhanced Loran (eLoran) data communication now uses 128-ary polar codes, improving error performance by 9.3 dB. This upgrade enhances transmission efficiency without affecting eLoran

Keywords:
Pulse Position Modulation (PPM)enhanced Loran (eLoran) systemnon-binary polar codespolar codes

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Area of Science:

  • Navigation Systems Engineering
  • Information Theory
  • Digital Communications

Background:

  • Enhanced Loran (eLoran) is a critical terrestrial backup for Global Satellite Navigation Systems (GNSS).
  • Traditional eLoran data communication uses Reed-Solomon (RS) codes, which have suboptimal error performance.
  • The 128-ary Pulse Position Modulation (PPM) scheme is integral to eLoran's positioning function.

Purpose of the Study:

  • To propose replacing the conventional RS code in eLoran with a 128-ary polar code.
  • To develop a Soft-Soft (SS) demodulation method for effective 128-ary polar code decoding.
  • To evaluate the error performance and data transmission efficiency of the proposed scheme.

Main Methods:

  • Implemented a 128-ary polar code compatible with the existing 128-ary PPM scheme.
  • Developed a Soft-Soft (SS) demodulation method using a correlation receiver.
  • Conducted comprehensive simulations to compare the proposed polar code with the traditional RS code.

Main Results:

  • The 128-ary polar code with SS demodulation achieved a 9.3 dB gain at 0.01 FER compared to RS code with EPD-MD demodulation.
  • The proposed scheme significantly improved data transmission efficiency, reducing duration by 2/3 or increasing message bits by 250% for similar error rates.
  • System positioning capabilities remained unaffected.

Conclusions:

  • Replacing RS codes with 128-ary polar codes offers substantial error performance improvements for eLoran.
  • The developed SS demodulation method effectively supports SCL decoding of 128-ary polar codes.
  • The proposed approach enhances eLoran data communication efficiency without compromising its core positioning function.