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Exploiting Phase Memory in Multicarrier Waveforms for Robust Underwater Acoustic Communication.

Imran Tasadduq1, Mohsin Murad2, Emad Felemban3

  • 1First City, Wadi Makkah Company, Makkah 24381, Saudi Arabia.

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Summary
This summary is machine-generated.

This study introduces a phase memory multicarrier system for robust underwater acoustic communication. The novel approach significantly improves reliability and reduces errors in challenging marine environments.

Keywords:
BERCPMGFDMUWAcontinuous phase modulationgeneralized frequency-division multiplexing

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Area of Science:

  • Marine technology
  • Signal processing
  • Acoustic communications

Background:

  • Underwater acoustic (UWA) communication is crucial for marine sensing but faces challenges like multipath and Doppler effects.
  • Existing memoryless multicarrier schemes struggle with UWA channel distortions.

Purpose of the Study:

  • To investigate a memory-based multicarrier modulation framework for enhanced UWA communication reliability.
  • To improve robustness against channel-induced distortions in dispersive underwater environments.

Main Methods:

  • Developed a memory-based multicarrier framework with controlled phase continuity at the symbol-mapping stage.
  • Conducted extensive bit-error-rate (BER) evaluations using simulations over realistic shallow-water acoustic channel models.
  • Analyzed various parameters including modulation indices, pulse-shaping filters, and receiver structures (matched-filter, zero-forcing).

Main Results:

  • The proposed phase-memory multicarrier system demonstrated consistent and significant BER improvements over memoryless systems.
  • Optimal performance was achieved with a modulation index of 7/16 (matched-filter) or 3/10 (zero-forcing).
  • The Dirichlet pulse shape proved most robust across different operating conditions.

Conclusions:

  • Phase-memory-aware multicarrier design is a practical strategy for reliable underwater sensing and communication.
  • The framework effectively mitigates distortions inherent in UWA channels.
  • Findings provide valuable insights for designing next-generation UWA systems.