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A Two-Stage Time-Domain Equalization Method for Mitigating Nonlinear Distortion in Single-Carrier THz Communication

Yunchuan Liu1,2,3,4, Hongcheng Yang1,2,3,4, Ziqi Liu1,2,3,4

  • 1Key Laboratory of Terahertz Optoelectronics, Ministry of Education, Beijing 100048, China.

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

A novel two-stage deep learning equalizer significantly reduces bit error rates in terahertz (THz) communication systems. This method effectively mitigates nonlinear distortions, enhancing data transmission reliability for future wireless networks.

Keywords:
LSTMdeep learningdigital communicationterahertz

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Area of Science:

  • Wireless Communication
  • Signal Processing
  • Machine Learning

Background:

  • Terahertz (THz) communication is crucial for high-speed data transmission due to its large bandwidth.
  • Nonlinear distortions and random interference degrade THz communication performance.
  • Effective equalization techniques are needed to enhance reliability.

Purpose of the Study:

  • To propose a two-stage deep learning-based time-domain equalization method for single-carrier THz systems.
  • To mitigate nonlinear distortions and improve communication reliability.
  • To validate the method's performance and generalization capability.

Main Methods:

  • A two-stage deep learning (DL) framework for time-domain equalization.
  • A progressive learning strategy capturing global then local channel characteristics.
  • Experimental validation at 230 GHz (2.1 m) and 310 GHz (1.5 m).

Main Results:

  • Significant reduction in bit error rate (BER) was achieved.
  • Approximately 92.15% BER reduction at 230 GHz and 83.33% at 310 GHz.
  • Stable performance demonstrated across varying experimental conditions.

Conclusions:

  • The proposed two-stage DL equalizer effectively mitigates nonlinear distortions in THz communication.
  • The method offers a promising solution for enhancing THz communication reliability.
  • This approach supports future research and development in THz wireless systems.