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Multi-directional decision feedback equalization for orthogonal time frequency space underwater acoustic

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This study introduces a novel multi-directional equalizer for Orthogonal Time Frequency Space (OTFS) modulation in underwater acoustic (UWA) systems. The new method significantly improves symbol detection in challenging, time-varying UWA environments.

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Area of Science:

  • Electrical Engineering
  • Signal Processing
  • Underwater Communications

Background:

  • Orthogonal Time Frequency Space (OTFS) modulation offers high performance in time-varying channels.
  • Underwater acoustic (UWA) environments present significant challenges due to rapid channel fluctuations.
  • Existing equalization techniques struggle to fully mitigate errors in complex UWA channels.

Purpose of the Study:

  • To develop a novel two-dimensional (2D) adaptive multichannel decision feedback equalization (DFE) technique for OTFS-based UWA systems.
  • To design and evaluate two distinct multi-directional DFE architectures to combat error propagation.
  • To enhance symbol detection accuracy and system performance in dynamic UWA environments.

Main Methods:

  • Introduction of a 2D adaptive multichannel DFE with a multi-directional structure tailored for OTFS modulation.
  • Development of two architectures: a parallel combination approach and a serial approach for directional DFEs.
  • Derivation of optimal weight factors for the parallel architecture and analysis of accelerated convergence in the serial architecture.

Main Results:

  • The proposed multi-directional 2D DFE algorithm demonstrates superior performance in lake environment simulations and experiments.
  • Comparative analysis shows significant outperformance over traditional 2D DFE methods.
  • The technique exhibits enhanced symbol detection capabilities, particularly with limited pilot resources and channel estimation accuracy.

Conclusions:

  • The novel multi-directional 2D DFE effectively mitigates error propagation in OTFS-based UWA communication systems.
  • Both parallel and serial multi-directional architectures offer distinct advantages in improving equalization performance.
  • The proposed method represents a significant advancement for reliable underwater acoustic communications.