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Biomimicking Covert Communication by Time-Frequency Shift Modulation for Increasing Mimicking and BER Performances.

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Summary
This summary is machine-generated.

This study introduces a novel underwater acoustic biomimicking communication method using Time Frequency Shift Keying (TFSK) to enhance both bit error rate (BER) and degree of mimic (DoM) for covert communications.

Keywords:
MOS testbio-mimeticconvert communicationsignal processingunderwater communication

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Area of Science:

  • Underwater Acoustic Communications
  • Biomimetic Systems
  • Signal Processing

Background:

  • Underwater acoustic (UWA) communications are crucial for covert operations.
  • Achieving simultaneous high bit error rate (BER) and degree of mimic (DoM) in UWA covert communications presents a significant challenge.

Purpose of the Study:

  • To propose a novel biomimicking covert communication method to simultaneously improve BER and DoM performances.
  • To enhance the effectiveness of underwater covert communications through advanced signal processing techniques.

Main Methods:

  • Development of a biomimicking covert communication method based on Time Frequency Shift Keying (TFSK).
  • Theoretical derivation of orthogonality requirements for TFSK time- and frequency-shifting units.
  • Multiplication of whistle signals with sequences exhibiting high correlation.
  • Implementation of two-step DoM assessments for long-term whistle signals.

Main Results:

  • The proposed method significantly increases DoM performance by 35%.
  • A zero BER was achieved at a Signal to Noise Ratio (SNR) of -6 dB.
  • Validation through computer simulations and practical lake and ocean experiments.

Conclusions:

  • The novel TFSK-based biomimicking method effectively enhances both DoM and BER in UWA covert communications.
  • The findings demonstrate a practical solution for robust and covert underwater communication systems.