【摘要】 为改善拟合效果,针对经验模态分解(empirical mode decomposition,EMD)算法存在的端点效应,提出一种改进的EMD算法——端点极值延拓方法.利用改进的EMD算法对观测信号进行分解,将分解分量连同之前的观测信号构成新的观测信号,从而将欠定情况转化为超定情况,最后利用独立成分分析(independent component analysis,ICA)算法得到源信号的估计.通过仿真实验对比,证明了本文算法的有效性.更多还原

【Abstract】 In order to improve the effect of data fitting,a method of extremum extension on endpoints is proposed,which is aimed at the endpoint effect of empirical mode decomposition( EMD) algorithm. The improved EMD algorithm is used to decompose the observed signals,and then the decomposed components together with the prior observed signals are regarded as new observed signals. Thus the underdetermined situation is changed into an overdetermined case.Finally,we use independent component analysis( ICA) algorithm to obtain the estimation of source signals. Simulation result shows that the proposed algorithm is effective.更多还原