Channel polarization and application of OFDM underwater acoustic communication

IF 3.4 2区物理与天体物理 Q1 ACOUSTICS

Applied Acoustics Pub Date : 2025-08-02 DOI:10.1016/j.apacoust.2025.110958

Yushuang Zhai , Li Ma , Minyan Huang , Haihong Feng

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引用次数: 0

Abstract

Existing research has referenced polar code construction methods in wireless channels to estimate the instantaneous reliability for underwater acoustic (UWA) polarized sub-channels. However, it overlooks potential mismatches between the instantaneous codebook and the actual channel state caused by complex time-varying characteristics of UWA channel, and lacks sufficient study on the evolution of sub-channel reliability. This paper extends the foundational channel polarization theory to propose a new framework for parallel UWA channel polarization based on Orthogonal Frequency Division Multiplexing (OFDM). By integrating the time–frequency statistical characteristics of UWA channels, the reliability theoretical model of polarized channels was established. And the intrinsic relationship between its evolution and channel parameters as well as system performance was deeply analyzed. Moreover, through simulation and lake trials, this paper investigates the time–frequency variation of polarized sub-channel reliability under incomplete channel polarization with finite code length. Additionally, it analyzes the impact of UWA channel parameters, such as Doppler shift and time-variation, on channel polarization distribution and polar-coded OFDM system performance. This paper provides a reference for subsequent practical polar coded OFDM communication, and streamlines the code construction process by avoiding the repeated assessments of polarized sub-channel’s reliability.

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OFDM水声通信的信道极化及应用

已有的研究参考了无线信道中的极性编码构造方法来估计水声极化子信道的瞬时可靠度。然而，它忽略了UWA信道复杂时变特性导致的瞬时码本与实际信道状态之间可能存在的不匹配，对子信道可靠性的演化研究不足。本文对基本信道极化理论进行了扩展，提出了一种基于正交频分复用（OFDM）的UWA并行信道极化新框架。通过综合UWA信道的时频统计特性，建立了极化信道可靠性理论模型。深入分析了其演化与信道参数和系统性能之间的内在关系。此外，通过仿真和湖泊试验，研究了有限码长的不完全信道极化情况下极化子信道可靠性的时频变化。此外，还分析了UWA信道参数（多普勒频移和时变）对信道极化分布和极码OFDM系统性能的影响。本文为后续实际极化编码OFDM通信提供了参考，避免了极化子信道可靠性的重复评估，简化了编码构建过程。

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.