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Time domain turbo equalization based on vector approximate message passing for multiple-input multiple-output

Wei-Zhe Li^1,2, Xiao Han^1,3, Guang-Jun Zhu^1,2

¹National Key Laboratory of Underwater Acoustic Technology, Harbin Engineering University, Harbin 150001, China.

The Journal of the Acoustical Society of America

|February 4, 2024

Summary

This summary is machine-generated.

This study introduces a novel receiver for underwater acoustic communications using vector approximate message passing (VAMP) turbo equalization. The VAMP-turbo receiver enhances performance and reduces complexity in multiple-input multiple-output (MIMO) systems.

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Area of Science:

Underwater Acoustic Communications
Signal Processing
Information Theory

Background:

Underwater acoustic communication systems face challenges with signal distortion and interference.
Multiple-Input Multiple-Output (MIMO) systems offer potential for improved data rates but increase complexity.
Existing receivers struggle to balance performance and computational load.

Purpose of the Study:

To propose a high-performance, low-complexity receiver for underwater acoustic MIMO systems.
To leverage time reversal processing and advanced equalization techniques.
To improve bit error rate and convergence performance compared to existing methods.

Main Methods:

Utilizing vector approximate message passing (VAMP) as a soft equalizer within a turbo equalization framework.
Implementing an iterative channel-estimation-based soft successive interference cancellation.
Employing passive time reversal technology to simplify channel processing.

Main Results:

The proposed VAMP-turbo receiver achieves near-optimal performance through self-iteration.
Significant reduction in computational complexity, especially for large MIMO systems.
Demonstrated superior performance over traditional parallel-VAMP and GAMP-turbo receivers in experimental tests.

Conclusions:

The VAMP-turbo receiver offers a practical solution for high-performance underwater acoustic MIMO communications.
Passive time reversal effectively reduces system complexity without performance degradation.
The VAMP-turbo approach surpasses GAMP-turbo in terms of bit error rate and convergence.