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Area of Science:

  • Underwater acoustics
  • Signal processing
  • Wireless communication

Background:

  • Multipath time delay causes signal distortion in acoustic communication.
  • Time reversal processing (TRP) offers a method to mitigate such distortions.
  • Signal diversity techniques (spatial, temporal, beam, frequency) are key components of TRP.

Purpose of the Study:

  • To compare the performance of TRP using different diversity methods.
  • To evaluate the effectiveness of various TRP diversity strategies under specific experimental conditions.
  • To analyze how the order of diversity impacts the performance of each method.

Main Methods:

  • Utilized experimental data from the biomimetic long-range acoustic communication experiment 2018 (BLAC18).
  • Employed binary phase-shift keying modulated signals transmitted over 60 km in the East Sea.
  • Used a 16-element vertical line array (∼42 m aperture) for signal reception.

Main Results:

  • Performance varied significantly with the order of diversity for each method.
  • Beam diversity with beamformed signals showed superior performance at diversity order one.
  • Spatial diversity achieved the best performance at the maximum order of diversity.

Conclusions:

  • The optimal TRP diversity method is dependent on the order of diversity utilized.
  • Spatial diversity is highly effective in environments with high channel variability and numerous receivers.
  • Findings provide insights into optimizing TRP for long-range underwater acoustic communication systems.