کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4954214 1443133 2016 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Analysis on frequency resolution of EMD based on B-spline interpolation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی کامپیوتر شبکه های کامپیوتری و ارتباطات
پیش نمایش صفحه اول مقاله
Analysis on frequency resolution of EMD based on B-spline interpolation
چکیده انگلیسی
Empirical mode decomposition (EMD) is an algorithm to split composite signals into narrow subbands termed intrinsic mode functions (IMFs) to obtain a meaningful instantaneous frequency. However, numerical experiments are still the dominant approach adopted to investigate the EMD algorithm. In this paper, the concrete form of IMFs is first discussed. Two simple criteria do not need to count the number of extrema and zero-crossings which are used to define IMFs are presented to identify IMFs. These criteria show that narrow-band signals with non-zero extrema, frequency modulation (FM) signals, and monocomponent signals are all IMFs. The EMD resolution is then analyzed from the digital signal processing perspective. Based on B-spline interpolation, the filtering characteristics of iterative B-spline filters developed to describe IMFs are analyzed. For the first time, a theoretical proof is presented to demonstrate that the EMD method cannot obtain narrow-band IMFs. Nevertheless, a theoretical proof is given to show that the frequency resolution of EMD can be improved in some extent with more sifting iterations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: AEU - International Journal of Electronics and Communications - Volume 70, Issue 9, September 2016, Pages 1235-1240
نویسندگان
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