论文标题
理论启发了深层网络,用于从离散的盲源数据中恢复瞬时频率提取和信号组件
Theory inspired deep network for instantaneous-frequency extraction and signal components recovery from discrete blind-source data
论文作者
论文摘要
本文关注的是恢复未知信号成分的反问题,以及由自适应谐波模型(AHM)控制的瞬时频率(IFS)的提取,从盲源复合信号的离散(甚至可能是不均匀的)样品中。 现有的分解方法和算法,包括最流行的经验模式分解(EMD)计算方案及其当前的修改,无法解决此反问题。 为了满足AHM公式并提取分解成分的IFS,称为固有模式函数(IMF),EMD的每个IMF通过Hilbert Transform扩展到复杂平面上半部分的分析函数,然后采取分析扩展的极性形式的实际部分。 不幸的是,这种方法通常无法令人满意地解决逆问题。 最近,为了解决逆问题,Daubechies和Maes提出了同步小波变换(SST)的概念,并在许多其他论文中进一步开发,而在我们先前的工作中发表的工作和计算和计算和计算的Harmonic Analysis,FOL,VOL,FOL,FOL,FOL,FOL,FOL。 30(2):243-261,2016。 在本文中,我们使用直接基于盲源信号的离散样品集的深神经网络提出了SSO的合成,直接基于离散的样本集,可能是不均匀采样的。 如许多数值示例所示,我们的方法是本地化的,包括具有不同信号到达和出发时间的组件。 它还产生信号组件的短期预测以及其IFS。 我们的神经网络的灵感来自理论,因此它们不需要在传统意义上进行任何培训。
This paper is concerned with the inverse problem of recovering the unknown signal components, along with extraction of their instantaneous frequencies (IFs), governed by the adaptive harmonic model (AHM), from discrete (and possibly non-uniform) samples of the blind-source composite signal. None of the existing decomposition methods and algorithms, including the most popular empirical mode decomposition (EMD) computational scheme and its current modifications, is capable of solving this inverse problem. In order to meet the AHM formulation and to extract the IFs of the decomposed components, called intrinsic mode functions (IMFs), each IMF of EMD is extended to an analytic function in the upper half of the complex plane via the Hilbert transform, followed by taking the real part of the polar form of the analytic extension. Unfortunately, this approach most often fails to resolve the inverse problem satisfactorily. More recently, to resolve the inverse problem, the notion of synchrosqueezed wavelet transform (SST) was proposed by Daubechies and Maes, and further developed in many other papers, while a more direct method, called signal separation operation (SSO), was proposed and developed in our previous work published in the journal, Applied and Computational Harmonic Analysis, vol. 30(2):243-261, 2016. In the present paper, we propose a synthesis of SSO using a deep neural network, based directly on a discrete sample set, that may be non-uniformly sampled, of the blind-source signal. Our method is localized, as illustrated by a number of numerical examples, including components with different signal arrival and departure times. It also yields short-term prediction of the signal components, along with their IFs. Our neural networks are inspired by theory, designed so that they do not require any training in the traditional sense.