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Nonlinear Harmonic Distortion of Complementary Golay Codes.

Fraser Hamilton^1,2, Peter Hoskins¹, George Corner¹

¹School of Science & Engineering, University of Dundee, Dundee, UK.

Ultrasonic Imaging

|January 12, 2023

Summary

This summary is machine-generated.

Nonlinear harmonic distortion significantly degrades the performance of complementary Golay coded pulse compression in ultrasound imaging. Some codes show better robustness to this distortion, impacting point-of-care scanner sensitivity.

Keywords:

Golay coded excitation nonlinear acoustics simulation

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Area of Science:

Ultrasound physics
Medical imaging technology
Acoustic signal processing

Background:

Miniaturization of electronics enables low-power, low-cost point-of-care ultrasound scanners.
Binary phase modulated coded excitations enhance sensitivity in these systems.
The impact of nonlinear harmonic distortion on complementary codes is not well understood.

Purpose of the Study:

To investigate the performance of complementary codes under nonlinear harmonic distortion.
To evaluate the robustness of different complementary code pairs to nonlinear effects.

Main Methods:

Simulations using nonlinear acoustics theory.
Analysis of Peak Sidelobe Level (PSL) degradation for complementary Golay codes.
Evaluation of 96 complementary code pairs.

Main Results:

Nonlinear propagation media significantly worsen PSL performance, from -198 dB (linear) to -62 dB (nonlinear).
A maximum PSL difference of 17 dB was observed between the most and least robust code pairs.
Certain complementary code pairs demonstrate greater resilience to nonlinear harmonic distortion.

Conclusions:

Nonlinear harmonic distortion is a critical factor affecting complementary Golay coded pulse compression in ultrasound.
Code selection is important for maintaining performance in nonlinear media.
Users should consider nonlinear effects when implementing these codes for ultrasound scanners.