Abstract

Due to the characteristics of the underwater acoustic channel environment, the development of underwater acoustic communication is faced with the problems of low information transmission rate, small capacity and poor reliability. The latest research shows that orbital angular momentum (OAM) carried by the acoustic vortex field opens up a new degree of freedom of underwater acoustic communication (UAC). In this paper, we first study the basic principles and production methods of OAM and its research status and development trends of UAC. Then, we study the application of OAM and underwater acoustic orthogonal frequency division multiplexing (OFDM) through two-dimensional fast Fourier transform (2D-FFT), and propose an UAC system based on OFDM-OAM. The simulation results show that compared with the traditional underwater acoustic OFDM system, the proposed OFDM-OAM system has a significant improvement in system capacity.

中文翻译：

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基于OFDM-OAM的水下声通信系统研究

摘要

由于水下声信道环境的特点，水下声通信的发展面临着信息传输速率低，容量小和可靠性差的问题。最新研究表明，声涡流所携带的轨道角动量（OAM）开启了水下声通信（UAC）的新自由度。本文首先研究了OAM的基本原理和生产方法，以及UAC的研究现状和发展趋势。然后，通过二维快速傅里叶变换（2D-FFT）研究了OAM和水下声正交频分复用（OFDM）的应用，提出了一种基于OFDM-OAM的UAC系统。仿真结果表明，与传统的水下声OFDM系统相比，