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Updated: Jun 13, 2026

Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping
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Published on: March 20, 2017

Flow-Guided Mimicry Covert Communication over Learned Legitimate OFDM Signal Manifolds.

Qi Feng1,2, Junyi Zhang1,2, Mingdi Li1,2

  • 1The 54th Research Institute of China Electronics Technology Group Corporation (CETC), Shijiazhuang 050081, China.

Sensors (Basel, Switzerland)
|June 12, 2026
PubMed
Summary
This summary is machine-generated.

This study introduces mimicry covert communication in the OFDM resource-grid domain. It embeds secret data by preserving legitimate signal distributions, enhancing recovery while maintaining low detectability.

Keywords:
OFDMcovert communicationlatent sign modulationlegitimacy detectionmimicry covert communicationnormalizing flowpolar codingrobust coordinate selection

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Area of Science:

  • Electrical Engineering
  • Computer Science
  • Information Theory

Background:

  • Classical covert communication assumes noise-only environments.
  • Shared spectrum necessitates detecting signals within legitimate traffic.
  • Existing methods struggle with detecting transmissions amidst background noise.

Purpose of the Study:

  • To develop mimicry covert communication in the post-demodulation OFDM resource-grid domain.
  • To embed covert bits while preserving legitimate signal characteristics.
  • To enhance covert message recovery under perturbations.

Main Methods:

  • Trained a normalizing flow on IEEE 802.11a NonHT-Data resource-grid observations.
  • Employed shared-key latent sign modulation for covert bit embedding.
  • Integrated a robustness-aware coordinate selector and CRC-Polar outer code with soft decoding.

Main Results:

  • The coded design significantly improved message recovery compared to uncoded methods.
  • Covert communication maintained low detectability by the warden (Willie).
  • Performance was validated against classifier-based and flow-density tests.

Conclusions:

  • Mimicry covert communication in the OFDM resource-grid domain is feasible.
  • The proposed embedding and coding scheme enhances robustness and security.
  • Future work includes over-the-air radio frequency chain validation.