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Iterative channel estimation-based soft successive interference cancellation for multiuser underwater acoustic

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This study introduces an improved underwater acoustic communication receiver that effectively handles multiple users and interference. The novel system successfully recovers nine-user data, enabling higher data rates in challenging acoustic environments.

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Area of Science:

  • Underwater Acoustic Communications
  • Signal Processing
  • Information Theory

Background:

  • Underwater acoustic communication systems face significant challenges from multiple access interference (MAI).
  • Existing receivers struggle to effectively mitigate MAI in multiuser scenarios.
  • Passive time-reversal (PTR) and turbo equalization are advanced techniques for improving communication reliability.

Purpose of the Study:

  • To develop a novel single-carrier multiuser receiver for underwater acoustic communications.
  • To enhance the performance of receivers in the presence of strong MAI.
  • To improve the accuracy of channel estimation and interference reconstruction in iterative receivers.

Main Methods:

  • Iterative block-by-block processing combining passive time-reversal (PTR) and direct-adaptation-based turbo equalization.
  • Successive interference cancellation (SIC) for initial symbol detection.
  • Channel impulse response (CIR) updating using post-SIC signals for improved MAI reconstruction and PTR combination.
  • Utilizing a priori symbol information in subsequent iterations to refine MAI and CIR estimates.

Main Results:

  • Demonstrated successful recovery of single-carrier nine-user communication data using quadrature phase-shift keying (QPSK).
  • Achieved an average data rate of 1.67 kbps per user.
  • Experimental validation using data collected at Songhua Lake, China, in 2019 confirmed the receiver's effectiveness.

Conclusions:

  • The proposed receiver effectively mitigates MAI in single-carrier multiuser underwater acoustic communication systems.
  • The iterative approach combining PTR and turbo equalization significantly enhances communication performance.
  • The system offers a viable solution for achieving higher data rates in challenging underwater acoustic environments.