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Modal dispersion compensation receiver for the long range shallow water acoustic communications
Dianlun Zhang1, Shuang Xiao1, Hongyu Cui1
1College of Underwater Acoustic Engineering, Harbin Engineering University, Harbin, 150001, China.
The Journal of the Acoustical Society of America
|July 1, 2019
Summary
A new receiver compensates for signal distortion in long-range shallow water communication by addressing modal dispersion. This improves underwater acoustic communication accuracy and performance over extended distances.
Area of Science:
- Underwater Acoustics
- Signal Processing
- Communication Systems
Background:
- Low-frequency signals in long-range shallow water experience severe attenuation and modal dispersion.
- These effects distort signals, degrading underwater communication performance.
Purpose of the Study:
- To propose a novel receiver design for compensating modal dispersion in underwater acoustic communication.
- To enhance communication accuracy and performance in challenging shallow water environments.
Main Methods:
- A modal dispersion compensation receiver is introduced.
- It utilizes a de-dispersion transform for intra-mode dispersion compensation.
- Rake combination is employed to merge multi-mode signal components.
Main Results:
- The proposed receiver effectively compensates for waveform expansion in higher-order modes.
- Improved distinguishability of modes from noise is achieved.
- Rake combination gain is enhanced, leading to higher communication accuracy.
Conclusions:
- The developed receiver significantly improves underwater acoustic communication reliability.
- It offers a substantial performance gain, demonstrated by a 3 dB improvement at 40 km range for 400 Hz signals.
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