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Area of Science:

  • Acoustic communication
  • Underwater acoustics
  • Signal processing

Background:

  • Acoustic communication using orbital angular momentum (OAM) offers efficient data transmission in aquatic environments.
  • Current methods for detecting OAM topological charge (TC) require full azimuthal acoustic pressure measurements, reducing efficiency and increasing bit error rate (BER).

Purpose of the Study:

  • To propose and validate a modified dynamic modal decomposition (DMD) method for precise TC detection in OAM acoustic beams.
  • To address the limitations of conventional methods by enabling TC detection from partially sampled acoustic fields.

Main Methods:

  • A modified dynamic modal decomposition (DMD) approach is developed for TC detection.
  • The method utilizes partial sampling of the acoustic field, reducing measurement requirements.
  • Numerical simulations are employed to validate the accuracy and performance of the proposed method.

Main Results:

  • The modified DMD method accurately extracts single or multiple TC magnitudes from partially sampled acoustic fields.
  • The proposed scheme demonstrates a lower BER compared to conventional orthogonal decoding under identical noise interference.
  • The modified DMD approach shows increased robustness against array misalignment.

Conclusions:

  • This research presents an efficient demodulation solution for acoustic OAM communication.
  • The modified DMD method simplifies receiver array design and enhances long-distance underwater data transmission capabilities.