移动水声通信多径传输非一致多普勒估计方法研究

发布时间：2018-07-17 01:45

【摘要】：现有水声通信中的多普勒估计方法一般都假定多径信道每条路径的多普勒因子相等,当各路径多普勒因子存在差异时,该类方法往往无法正确估计出每径的多普勒因子,导致补偿后的信号存在较大误差。为此该文在分析水声信道稀疏特性的基础上,提出一种基于稀疏表示理论的非一致多普勒估计方法。该方法结合水声多径信道与非一致多普勒稀疏特性生成包含信道信息的超完备字典,将每径的非一致多普勒因子估计转化为基于超完备字典的稀疏重构求解,实现非一致多普勒因子的准确估计。仿真结果表明,所提方法不仅能估计出差异较大的非一致多普勒因子,而且对于大多普勒频偏的估计也相当有效,特别适合于高速移动水声通信中的多普勒估计。
[Abstract]:The existing Doppler estimation methods in underwater acoustic communication generally assume that the Doppler factor of each path is equal in multipath channel. When the Doppler factor of each path is different, the Doppler factor of each path can not be estimated correctly by this method. There is a large error in the compensated signal. Based on the analysis of the sparse characteristics of underwater acoustic channels, this paper presents a non-uniform Doppler estimation method based on sparse representation theory. This method combines the characteristics of underwater acoustic multipath channel and non-uniform Doppler sparsity to generate supercomplete dictionaries containing channel information. The non-uniform Doppler factor estimation of each path is transformed into sparse reconstruction based on super-complete dictionaries. The accurate estimation of non-uniform Doppler factor is realized. The simulation results show that the proposed method can not only estimate the non-uniform Doppler factor, but also estimate the large Doppler frequency offset, which is especially suitable for the Doppler estimation in high-speed mobile underwater acoustic communication.
【作者单位】：江苏科技大学电子信息学院;
【基金】：国家自然科学基金(11204109) 江苏省高校自然科学基金(12KJB510003,13KJB510007) 江苏省高校优势学科项目江苏省“青蓝工程”项目资助课题
【分类号】：TN929.3

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