Discrete Hartley transform - orthogonal frequency division multiplexing underwater acoustic communication system based on complex-to-real conversion

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics Pub Date : 2025-07-24 DOI:10.1016/j.apacoust.2025.110944

Jinqiu Wu , Wenbo Zhang , Rouchi Chen , Xiaofei Qi , Gang Qiao , Zhiwei Zhao , Haijun Tan

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Abstract

In this paper, we propose a Complex-to-Real Transformation (C2RT) for Discrete Hartley Transform Orthogonal Frequency Division Multiplexing (DHT-OFDM) in underwater acoustic communication system. C2RT is an efficient system modulation scheme based on the principle of index modulation. Traditional DHT-OFDM systems only support modulation and demodulation in the real domain, which limits the use of high-order phase modulation. This restriction makes it difficult to improve communication rates and bandwidth utilization. C2RT is an effective solution to this problem. By incorporating this algorithm into DHT-OFDM system, high-order phase modulation can be achieved while maintaining the system's real-valued characteristics. Additionally, due to the sparsity of its output sequence, C2RT provides higher transmission accuracy compared to direct transmission schemes.

The experimental verifies that the DHT-OFDM system proposed in this paper can be applied to 300 m and 5 km underwater acoustic transmission with less error bits. This makes the proposed C2RT DHT-OFDM method a promising approach for enhancing underwater communication technologies.

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离散哈特利变换-基于复实转换的正交频分复用水声通信系统

本文提出了一种用于水声通信系统中离散哈特利变换正交频分复用（DHT-OFDM）的复实变换（C2RT）。C2RT是一种基于指数调制原理的高效系统调制方案。传统的DHT-OFDM系统只支持实域中的调制解调，限制了高阶相位调制的使用。这种限制使得提高通信速率和带宽利用率变得困难。C2RT是解决这个问题的有效方法。将该算法应用到DHT-OFDM系统中，可以在保持系统实值特性的同时实现高阶相位调制。此外，由于其输出序列的稀疏性，与直接传输方案相比，C2RT具有更高的传输精度。实验验证了本文提出的DHT-OFDM系统可以应用于300 m和5 km的水声传输，并且误差较小。这使得提出的C2RT DHT-OFDM方法成为增强水下通信技术的一种很有前途的方法。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Applied Acoustics 物理-声学

CiteScore

7.40

自引率

11.80%

发文量

618

审稿时长

7.5 months

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.