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用于实测超声水下信道的正交频分复用（OFDM）系统设计

OFDM System Design for Measured Ultrasonic Underwater Channels.

作者信息

Cobacho-Ruiz Pablo, Cañete Francisco Javier, Martos-Naya Eduardo, Fernández-Plazaola Unai

机构信息

Communications and Signal Processing Lab, Telecommunication Research Institute (TELMA), ETS Ingeniería de Telecomunicación, Universidad de Málaga, 29010 Málaga, Spain.

出版信息

Sensors (Basel). 2022 Jul 29;22(15):5703. doi: 10.3390/s22155703.

DOI:10.3390/s22155703
PMID:35957259
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9371234/
Abstract

In this paper, we present the development of a multicarrier modulation system of low complexity for broadband underwater acoustic communications (UAC), whose frequency band is located in the ultrasonic range, specifically between 32 kHz and 128 kHz. Underwater acoustic channels are recognized among the most hostile communication channels due to their strong time and frequency selectivity and, hence, the design of high-performance systems is a challenge that is difficult to resolve at the present time with state-of-art technology. The aim of the proposed system is to reach a reasonable bit rate, between 40 and 50 Kbps, over these channels that allows, for instance, the transmission of video signals of limited quality. We describe an orthogonal frequency division multiplexing (OFDM) modem prototype with a parameter setting and design specifically adapted to the channel nature. For this purpose, actual measurements carried out at the Mediterranean sea, on shallow waters, have been used to evaluate the system performance and to optimize the design. A discussion on several modulations and OFDM configurations is presented that leads to the selection of differential and non-differential quadri-phase shift keying (QPSK) as good candidates depending on synchronization capabilities.

摘要

在本文中，我们展示了一种用于宽带水下声学通信（UAC）的低复杂度多载波调制系统的开发，该系统的频段位于超声范围内，具体为32千赫至128千赫之间。由于其强烈的时间和频率选择性，水下声学信道被认为是最恶劣的通信信道之一，因此，高性能系统的设计是一项挑战，目前利用现有技术难以解决。所提出系统的目标是在这些信道上达到40至50千比特每秒之间的合理比特率，例如允许传输质量有限的视频信号。我们描述了一种正交频分复用（OFDM）调制解调器原型，其参数设置和设计专门针对信道特性进行了调整。为此，在地中海浅水区进行的实际测量已被用于评估系统性能并优化设计。文中讨论了几种调制方式和OFDM配置，根据同步能力得出差分和非差分四相移键控（QPSK）是不错的选择。

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本文引用的文献

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Measurement and Modeling of Narrowband Channels for Ultrasonic Underwater Communications.用于超声水下通信的窄带信道的测量与建模
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How snapping shrimp snap: through cavitating bubbles.鼓虾如何发出噼啪声：通过形成空化气泡。
Science. 2000 Sep 22;289(5487):2114-7. doi: 10.1126/science.289.5487.2114.