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Effects of Median Filtering on Fractional Processes

[+] Author Affiliations
Hu Sheng

Dalian Jiaotong University, Dalian, China; Utah State University, Logan, UT

YangQuan Chen

Utah State University, Logan, UT

Paper No. DETC2011-47880, pp. 329-334; 6 pages
doi:10.1115/DETC2011-47880
From:
  • ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference
  • Volume 3: 2011 ASME/IEEE International Conference on Mechatronic and Embedded Systems and Applications, Parts A and B
  • Washington, DC, USA, August 28–31, 2011
  • Conference Sponsors: Design Engineering Division and Computers and Information in Engineering Division
  • ISBN: 978-0-7918-5480-8
  • Copyright © 2011 by ASME

abstract

Median filtering, an effective non-linear signal enhancement technique, has been successfully used for the suppression of impulsive noise and extracting features from noisy signals. Although median filtering can effectively preserve the sharp changes in signals, some signal distortion may be introduced and some features of signals may be lost. In this research, we investigate the effects of median filtering on fractional processes which are characterized by the heavy-tailed distribution or the long-range dependence (LRD). The effects of median filtering on heavy-tailed distribution characteristic of α -stable processes, and on LRD property of long-range dependent processes are investigated, respectively. Besides, the effects of median filtering on both the heavy tailed distribution and the LRD properties of fractional autoregressive integrated moving average (FARIMA) with stable innovations time series are studied. The analysis results show that the heavy-tailed distribution and the LRD properties of fractional processes are evidently affected by median filtering.

Copyright © 2011 by ASME
Topics: Filtration

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