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Time Reversal Acoustic Communication Using Filtered Multitone Modulation.

Lin Sun1,2, Baowei Chen3,4, Haisen Li5,6

  • 1College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin 150001, China. zcbsunny@hrbeu.edu.cn.

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|September 23, 2015
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Summary
This summary is machine-generated.

Filtered multitone (FMT) modulation improves underwater acoustic communication by reducing intersymbol interference (ISI) with time reversal (TR). This method enhances TR performance and simplifies post-processing equalization.

Keywords:
adaptive equalizationfiltered multitone modulationtime reversalunderwater acoustic communication

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Area of Science:

  • Underwater acoustics
  • Digital communications
  • Signal processing

Background:

  • Underwater acoustic channels suffer severe multipath, causing significant intersymbol interference (ISI).
  • High symbol rates in single-carrier (SC) time reversal (TR) acoustic communication exacerbate ISI, degrading TR performance.
  • Existing methods require complex adaptive equalizers for post-processing to mitigate ISI.

Purpose of the Study:

  • To propose a novel time reversal (TR) acoustic communication method using filtered multitone (FMT) modulation.
  • To reduce residual ISI in TR-processed signals.
  • To enhance the performance and reduce computational complexity of adaptive equalization.

Main Methods:

  • Filtered multitone (FMT) modulation to encode information onto spectrally contained subcarriers.
  • Time reversal (TR) technique for signal focusing and multipath mitigation.
  • Adaptive equalization at the receiver to suppress residual ISI and noise.

Main Results:

  • The proposed FMT-based TR method demonstrated improved performance compared to SC-based TR.
  • Reduced computational complexity for adaptive equalization was observed.
  • Effectiveness validated through simulations and experimental pool data.

Conclusions:

  • Filtered multitone (FMT) modulation is an effective technique for improving time reversal (TR) acoustic communication.
  • The proposed method offers a more efficient approach to mitigating ISI in underwater acoustic channels.
  • This advancement has implications for developing more robust underwater communication systems.