{"title":"A new scheme of low frequency long range underwater acoustic communication with high spectral efficiency","authors":"Jiati Li , Bin Wang , Yiwang Huang","doi":"10.1016/j.apacoust.2025.110668","DOIUrl":null,"url":null,"abstract":"<div><div>This paper presents an underwater acoustic communication scheme that combines the modal dispersion compensation with the channel adaptive equalization to address the challenge of low spectral efficiency in the low-frequency long-range underwater communication in shallow water. We designed both the transmitter and receiver to improve the communication efficiency by eliminating the spread spectrum in the transmitted signal. At the receiver, the de-dispersion transform compensated for the preamble, enhancing the frame synchronization accuracy. The proposed dispersion compensation method addressed the non-instantaneous pulses, eliminating the nonlinear phase distortion in the received signal. The adaptive equalization further compensated for the frequency-selective fading caused by multipath propagation. The simulation and experimental results demonstrated that this scheme significantly enhanced the spectral efficiency, particularly in the channels with severe dispersion.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"235 ","pages":"Article 110668"},"PeriodicalIF":3.4000,"publicationDate":"2025-03-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Applied Acoustics","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0003682X25001409","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"ACOUSTICS","Score":null,"Total":0}
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Abstract
This paper presents an underwater acoustic communication scheme that combines the modal dispersion compensation with the channel adaptive equalization to address the challenge of low spectral efficiency in the low-frequency long-range underwater communication in shallow water. We designed both the transmitter and receiver to improve the communication efficiency by eliminating the spread spectrum in the transmitted signal. At the receiver, the de-dispersion transform compensated for the preamble, enhancing the frame synchronization accuracy. The proposed dispersion compensation method addressed the non-instantaneous pulses, eliminating the nonlinear phase distortion in the received signal. The adaptive equalization further compensated for the frequency-selective fading caused by multipath propagation. The simulation and experimental results demonstrated that this scheme significantly enhanced the spectral efficiency, particularly in the channels with severe dispersion.
期刊介绍：
Since its launch in 1968, Applied Acoustics has been publishing high quality research papers providing state-of-the-art coverage of research findings for engineers and scientists involved in applications of acoustics in the widest sense.
Applied Acoustics looks not only at recent developments in the understanding of acoustics but also at ways of exploiting that understanding. The Journal aims to encourage the exchange of practical experience through publication and in so doing creates a fund of technological information that can be used for solving related problems. The presentation of information in graphical or tabular form is especially encouraged. If a report of a mathematical development is a necessary part of a paper it is important to ensure that it is there only as an integral part of a practical solution to a problem and is supported by data. Applied Acoustics encourages the exchange of practical experience in the following ways: • Complete Papers • Short Technical Notes • Review Articles; and thereby provides a wealth of technological information that can be used to solve related problems.
Manuscripts that address all fields of applications of acoustics ranging from medicine and NDT to the environment and buildings are welcome.
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