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Applied Sciences
Special Issues
Underwater Acoustic Communications and Sensor Networks
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Underwater Acoustic Communications and Sensor Networks

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Electrical, Electronics and Communications Engineering".

Deadline for manuscript submissions: closed (20 August 2023) | Viewed by 2519

Special Issue Editors

Prof. Dr. Huifang Chen

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Guest Editor
Department of Information & Communication Engineering, College of Information Science & Electronic Engineering, Zhejiang University (Yuquan Campus), Hangzhou 310027, China
Interests: intelligent information processing; network and communication security
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Miguel-Angel Luque-Nieto

E-Mail Website
Guest Editor
Telecommunications Engineering Department (IC), Universidad de Málaga, Boulevar de Louis Pasteur nº 35, 29010 Málaga, Spain
Interests: underwater sensor networks; underwater protocols; underwater acoustic sensor networks

Special Issue Information

Dear Colleagues,

In recent decades, digital communication technology has developed rapidly, of which underwater communication is an important part. At present, acoustic communication is a very effective means of underwater long-distance information transmission. People expect to realize the transmission of text, language, pictures and other signals through underwater acoustic communication technology.

After years of development, underwater acoustic communication technology has developed to the stage of networking. The application of network technology (ad hoc) in radio to underwater acoustic communication networks can realize all-around and three-dimensional communication in the ocean (which can be combined with AUV, UUV and other unmanned equipment used in combination). However, there are still many problems to be overcome, such as complex underwater acoustic channels, high environmental noise, narrow channels, low carrier frequency, and other factors restricting the data transmission rate.

This Special Issue aims to collect high-quality research papers on underwater acoustic communications and networking systems.

Prof. Dr. Huifang Chen
Prof. Dr. Miguel-Angel Luque-Nieto
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Applied Sciences is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Published Papers (2 papers)

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Research

17 pages, 3654 KiB  
Article
Centralized Co-Operative Detection Algorithm Based on Double Thresholds for Underwater Acoustic Networks
by Jing Zhang, Qiqi Wang and Rui Zhang
Appl. Sci. 2023, 13(5), 3339; https://doi.org/10.3390/app13053339 - 06 Mar 2023
Viewed by 981
Abstract
Spectrum-sensing algorithms are one of the effective solutions to the problem of the underwater spectrum resource constraint. However, because the underwater acoustic channel is one of the most complex channels, it has many characteristics, such as a limited communication bandwidth, multipath effect, and [...] Read more.
Spectrum-sensing algorithms are one of the effective solutions to the problem of the underwater spectrum resource constraint. However, because the underwater acoustic channel is one of the most complex channels, it has many characteristics, such as a limited communication bandwidth, multipath effect, and ocean noise, all of which render the spectrum detection more difficult. As basic spectrum-sensing algorithms, energy detection algorithms are widely used in underwater acoustic communication and radio. However, most of the existing dual-threshold energy detection methods do not judge the signals with energy values between the thresholds or discard them directly. In this paper, a double-threshold centralized co-operative detection algorithm is proposed to solve this problem. In this algorithm, each sensing user makes a judgment independently, and if the historical energy statistics are between the thresholds, the number of sampling points is increased, and the judgment is made again. In the centralized collaborative sensing algorithm, each sensing user’s results are sent to the fusion center, which uses the OR judgment criterion to make decisions. Simulation results show that this algorithm can improve the detection performance and reduce the error rate. Full article
(This article belongs to the Special Issue Underwater Acoustic Communications and Sensor Networks)
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14 pages, 1976 KiB  
Article
PTA-Sync: Packet-Train-Aided Time Synchronization for Underwater Acoustic Applications
by A-Ra Cho and Youngchol Choi
Appl. Sci. 2023, 13(2), 978; https://doi.org/10.3390/app13020978 - 11 Jan 2023
Viewed by 942
Abstract
In underwater acoustic applications, time synchronization errors accumulate severely with time, owing to the unpredictable propagation delay change induced by mobility and low sound propagation speed. In previously reported schemes, error accumulation during underwater acoustic time synchronization occurred, decreasing their performance and affecting [...] Read more.
In underwater acoustic applications, time synchronization errors accumulate severely with time, owing to the unpredictable propagation delay change induced by mobility and low sound propagation speed. In previously reported schemes, error accumulation during underwater acoustic time synchronization occurred, decreasing their performance and affecting their applicability. To overcome this limitation, we propose packet-train-aided time synchronization (PTA-Sync) for underwater acoustic application. The proposed PTA-Sync adaptively tracks one-way travel time (OWTT) change using three-dimensional linear velocity vector, the transmit time difference and arrival time difference of two adjacent packets in a packet train, and the position information of a mobile reference node. Thus, this scheme enables us to reduce the synchronization error accumulation rate by estimating the propagation delay change more accurately. Simulation results show PTA-Sync achieves higher accuracy than existing OWTT-based synchronization schemes. Thus, PTA-Sync can be effectively used in underwater exploratory activities because it can successfully reduce time synchronization errors. Full article
(This article belongs to the Special Issue Underwater Acoustic Communications and Sensor Networks)
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