{"title":"Estimation of time-varying underwater acoustic channels via an improved sparse adaptive orthogonal matching pursuit algorithm","authors":"Yunfeng Hu , Jun Tao , Feng Tong","doi":"10.1016/j.apacoust.2025.110624","DOIUrl":null,"url":null,"abstract":"<div><div>This paper explores the estimation of time-varying sparse channels for single-carrier underwater acoustic (UWA) communications via dynamic compressed sensing algorithms. In light of existing sparse adaptive orthogonal matching pursuit (SpAdOMP) algorithm, we develop an improved SpAdOMP (I-SpAdOMP) scheme suited for UWA channel estimation. The improvement of I-SpAdOMP channel estimation lies in two aspects: First, an adaptive fuzzy threshold (AFT) strategy is proposed to identify the time-varying channel support set, avoiding the requirement of channel sparsity knowledge by original SpAdOMP scheme. Second, a complex-valued online penalty expectation maximization (OPEM) scheme is employed to estimate channel taps, achieving better accuracy compared with the normalized least mean squares (NLMS) adaptive algorithm used in SpAdOMP. Advantages of the I-SpAdOMP based channel estimation have been verified by experimental data of two at-sea UWA communication trials.</div></div>","PeriodicalId":55506,"journal":{"name":"Applied Acoustics","volume":"233 ","pages":"Article 110624"},"PeriodicalIF":3.4000,"publicationDate":"2025-02-24","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/S0003682X25000969","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}
引用次数: 0
Abstract
This paper explores the estimation of time-varying sparse channels for single-carrier underwater acoustic (UWA) communications via dynamic compressed sensing algorithms. In light of existing sparse adaptive orthogonal matching pursuit (SpAdOMP) algorithm, we develop an improved SpAdOMP (I-SpAdOMP) scheme suited for UWA channel estimation. The improvement of I-SpAdOMP channel estimation lies in two aspects: First, an adaptive fuzzy threshold (AFT) strategy is proposed to identify the time-varying channel support set, avoiding the requirement of channel sparsity knowledge by original SpAdOMP scheme. Second, a complex-valued online penalty expectation maximization (OPEM) scheme is employed to estimate channel taps, achieving better accuracy compared with the normalized least mean squares (NLMS) adaptive algorithm used in SpAdOMP. Advantages of the I-SpAdOMP based channel estimation have been verified by experimental data of two at-sea UWA communication trials.
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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