摘要
针对局域波分解存在的端点效应问题,提出了三角波形相似估计法对信号端点局部均值进行估计。方法根据三角形相似原理设定了两个相似估计误差,通过两次筛选得到与边界三角波形最相似的三角波形,从而实现对端点局部均值的估计。过镜面闭合延拓法、多项式拟合估计法、边界波形匹配预测法和三角波形相似估计法进行比较研究。仿真和比较结果表明,方法在运行时间、存储空间和最大估计误差三个方面均具有较好的性能,能够有效地抑制局域波分解端点效应。
Aiming at the end effect problem of local wave method, a similar triangle waveform estimation method for estimating the mean value of the ends is proposed. Two kinds of similar estimation error are defined on the basis of the principle of similar triangles. Using two - filtration to select the best similar triangle waveform, then the mean value of the ends is estimated. Comparison is made among the mirror extending method, the polynomial curvefitting method, the waveform matching method and the similar triangle waveform estimation method. The results of simulation and comparison show that the end effect can be effectively restrained.
出处
《计算机仿真》
CSCD
2008年第11期312-315,共4页
Computer Simulation
关键词
局域波分解
端点效应
三角波形
相似
Local wave method
End effect
Triangle waveform
Similarity
