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Spatial diversity processing mechanism based on the distributed underwater acoustic communication system.

Manli Zhou1, Hao Zhang1,2, Tingting Lv1

  • 1Department of Electronic Engineering, Ocean University of China, Qingdao, Shandong, China.

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This study introduces a distributed underwater acoustic diversity communication system (DUA-DCS) to overcome shallow water communication challenges. The DUA-DCS system significantly improves reliability and reduces bit error rates through advanced signal processing techniques.

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Area of Science:

  • Underwater Acoustic Communication
  • Signal Processing
  • Communication Systems Engineering

Background:

  • Shallow water acoustic communication faces challenges from signal delays and multipath effects.
  • Single-link systems exhibit unreliability due to these environmental factors.

Purpose of the Study:

  • To propose a distributed underwater acoustic diversity communication system (DUA-DCS) for enhanced reliability.
  • To develop advanced signal processing techniques for both uplink and downlink communication.

Main Methods:

  • Uplink: Decision feedback equalizer embedded phase-locked loop and maximum signal-to-interference ratio combining (DFE-PLL-MSIRC) for waveform-level diversity combining.
  • Downlink: Complex orthogonal space-time block coding (COSTBC) with a generalized complex orthogonal transmission matrix.
  • Utilized a maneuverable distributed cross-medium buoy network to establish parallel communication links.

Main Results:

  • DFE-PLL-MSIRC achieved over 5.2 dB diversity gain and reduced BER by at least one order of magnitude compared to single-link systems.
  • The proposed downlink COSTBC achieved over 6 dB diversity gain compared to single-link systems.
  • DFE-PLL-MSIRC showed approximately 3 dB more diversity gain than a comparison algorithm.

Conclusions:

  • The DUA-DCS, employing DFE-PLL-MSIRC and COSTBC, effectively mitigates shallow water acoustic communication issues.
  • The proposed system demonstrates significant improvements in diversity gain and bit error rate reduction.
  • This research offers a robust solution for reliable underwater acoustic communication.