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Updated: May 17, 2025

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Covert Communication Scheme for OOK in Asymmetric Noise Systems.

Weicheng Xu1, Xiaopeng Ji1, Ruizhi Zhu1

  • 1School of Electronics and Information Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China.

Sensors (Basel, Switzerland)
|May 14, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel phase-based On-Off Keying (OOK) coding scheme for covert communications in asymmetric noise environments. Adjusting the initial phase enhances covertness and transmission rates by exploiting noise characteristics.

Keywords:
On–Off KeyingTaylor series expansionasymmetric noisecovert communication

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Area of Science:

  • Information Theory
  • Communications Engineering
  • Signal Processing

Background:

  • Existing covert communication schemes using On-Off Keying (OOK) are limited by their inability to handle asymmetric noise environments.
  • This limitation restricts their application in advanced scenarios like terahertz and underwater acoustic covert communications.

Purpose of the Study:

  • To propose a novel phase-based OOK coding scheme designed for covert communications in asymmetric noise conditions.
  • To enhance the performance of covert transmissions by exploiting noise characteristics for better masking.

Main Methods:

  • A phase-based OOK coding scheme is proposed, allowing transmitter phase adjustment to align with stronger noise components.
  • Kullback-Leibler (KL) divergence and mutual information are used to quantify covertness and transmission performance.
  • An optimization problem is formulated and solved to maximize the covert transmission rate by adjusting signal distribution, amplitude, and initial phase.

Main Results:

  • The initial phase angle and Gaussian noise components significantly impact both covertness and transmission rates in asymmetric noise systems.
  • Optimizing the initial phase to align with lower noise directions effectively suppresses interference.
  • The proposed scheme demonstrates improved covertness and transmission performance in asymmetric noise environments.

Conclusions:

  • The phase-based OOK coding scheme offers a viable solution for covert communications in challenging asymmetric noise scenarios.
  • Strategic adjustment of the initial phase is crucial for maximizing covertness and data rates.
  • This research advances covert communication capabilities in complex environments like terahertz and underwater acoustics.