Combining OMP With a Superimposed Pilot Sparse Channel Estimation Method for Underwater Acoustic OCDM Systems

IF 4.4 3区计算机科学 Q2 TELECOMMUNICATIONS

IEEE Communications Letters Pub Date : 2025-07-01 DOI:10.1109/LCOMM.2025.3584761

Rui Xue;Shuaichuang Wang

引用次数: 0

Abstract

Recently, sparse channel estimation in underwater acoustic orthogonal chirp-division multiplexing (OCDM) communication has attracted increasing attention. However, the channel estimation method based on a superimposed pilot structure results in noise interference in the zero-coefficient term of the sparse channel, making it difficult to improve estimation performance. In this work, we propose an acoustic sparse channel estimation method that combines the orthogonal matching pursuit (OMP) with a superimposed pilot. A special frame structure is designed to achieve low-complexity carrier frequency offset estimation. The simulation demonstrate show that this method improves the accuracy of frequency offset estimation and reduces the normalized mean square error of the channel impulse response under the conditions of an underwater acoustic sparse channel from the Watermark dataset.

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结合OMP和叠加导频稀疏信道估计的水声OCDM系统

近年来，水声正交调频复用（OCDM）通信中的稀疏信道估计问题越来越受到人们的关注。然而，基于叠加导频结构的信道估计方法在稀疏信道的零系数项存在噪声干扰，难以提高信道估计性能。在这项工作中，我们提出了一种将正交匹配追踪（OMP）与叠加导频相结合的声学稀疏信道估计方法。设计了一种特殊的帧结构来实现低复杂度的载波频偏估计。仿真结果表明，该方法提高了频偏估计的精度，降低了水印数据集中水声稀疏信道脉冲响应的归一化均方误差。

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

IEEE Communications Letters 工程技术-电信学

CiteScore

8.10

自引率

7.30%

发文量

590

审稿时长

2.8 months

期刊介绍： The IEEE Communications Letters publishes short papers in a rapid publication cycle on advances in the state-of-the-art of communication over different media and channels including wire, underground, waveguide, optical fiber, and storage channels. Both theoretical contributions (including new techniques, concepts, and analyses) and practical contributions (including system experiments and prototypes, and new applications) are encouraged. This journal focuses on the physical layer and the link layer of communication systems.