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Time reversal communication with a mobile source.

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Summary
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Doppler compensation via resampling may not be needed for underwater acoustic communications. Time reversal with frequent channel updates offers similar performance to resampling, saving computational resources.

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Area of Science:

  • Underwater acoustics
  • Signal processing
  • Communication systems

Background:

  • Broadband underwater acoustic signals experience Doppler shifts due to source-receiver motion.
  • Doppler shifts necessitate compensation, typically through resampling, in mobile underwater acoustic communications.
  • Resampling can introduce computational overhead and potential signal distortion.

Purpose of the Study:

  • To investigate the necessity of resampling for Doppler compensation in underwater acoustic communications.
  • To evaluate the performance of a channel-estimate-based time reversal approach without resampling.
  • To assess the computational efficiency of the proposed method.

Main Methods:

  • Utilized experimental data in the 20-30 kHz frequency range.
  • Applied a channel-estimate-based time reversal technique with frequent channel updates.
  • Compared communication performance with and without resampling.

Main Results:

  • Time reversal communication without resampling achieved performance comparable to that with resampling.
  • The method demonstrated similar signal fidelity and data recovery rates.
  • A modest computational saving was observed by omitting the resampling step.

Conclusions:

  • Resampling may be unnecessary for Doppler compensation in broadband underwater acoustic communications when using channel-estimate-based time reversal.
  • Frequent channel updates are crucial for the effectiveness of the time reversal approach.
  • This technique offers a computationally efficient alternative for mobile underwater acoustic systems.