Timing estimation of multiple hyperbolic frequency-modulated signals based on multicarrier underwater acoustic communication,Transactions on Emerging Telecommunications Technologies

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Timing estimation of multiple hyperbolic frequency-modulated signals based on multicarrier underwater acoustic communication
Transactions on Emerging Telecommunications Technologies ( IF 2.5 ) Pub Date : 2022-08-22 , DOI: 10.1002/ett.4636
Xuerong Cui ₁ , Peihao Yan ₁ , Juan Li ₂ , Hao Zhang ₃ , Shibao Li ₁ , Jianhang Liu ₂

Affiliation

Underwater acoustic channel is much more complex than radio channel. Background noise, multipath extension, and Doppler frequency shift are all factors that affect high-speed and stability for underwater communication. Orthogonal frequency division multiplexing (OFDM) is a modulation technology with high spectrum efficiency and strong anti-multipath ability, usually used in high-speed underwater acoustic communication. Signal arrival time detection and timing estimation before receiving data is an essential module in an underwater communication system. Timing estimation error will seriously affect the demodulation of the signal. In order to solve the problem of a complex channel environment in underwater acoustic communication system, a timing estimation method is proposed based on multiple hyperbolic frequency-modulated (MHFM) signals. In order to improve the performance of underwater acoustic communication systems, this article proposes an iterative method of correlation-sum-mean absolute error (MAE) based on hyperbolic frequency-modulated (HFM). The simulation results show that the proposed method can provide better performance and higher timing estimation accuracy under the conditions of low signal-to-noise ratio (SNR) and Doppler effect under oceanic noise channel and Doppler spread channel.

中文翻译：

基于多载波水声通信的多双曲线调频信号定时估计

水声信道比无线电信道复杂得多。背景噪声、多径扩展和多普勒频移都是影响水下通信高速和稳定的因素。正交频分复用（OFDM）是一种频谱效率高、抗多径能力强的调制技术，常用于高速水声通信。接收数据前的信号到达时间检测和定时估计是水下通信系统中必不可少的模块。定时估计误差会严重影响信号的解调。为解决水声通信系统信道环境复杂的问题，提出了一种基于多双曲调频(MHFM)信号的定时估计方法。为了提高水声通信系统的性能，本文提出了一种基于双曲线调频（HFM）的相关和平均绝对误差（MAE）迭代方法。仿真结果表明，在海洋噪声信道和多普勒扩频信道下的低信噪比和多普勒效应条件下，所提方法能够提供更好的性能和更高的定时估计精度。

更新日期：2022-08-22

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