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Time–frequency analysis of nonstationary fusion plasma signals: A comparison between the Choi–Williams distribution and wavelets

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2 Author(s)
Figueiredo, A. C. A. ; Centro de Fusão Nuclear, Associação Euratom–IST, Instituto Superior Técnico, 1049-001 Lisboa, Portugal ; Nave, M. F. F.

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The continuous wavelet transform scalogram, and recently the Choi–Williams distribution, have both been used to improve upon the short-time Fourier transform spectrogram in the analysis of some nonstationary phenomena in fusion plasmas. Here, a comparison is made with real fusion plasma signals that shows the advantages of the Choi–Williams distribution over wavelets as a complementary tool to the spectrogram.

Published in:

Review of Scientific Instruments  (Volume:75 ,  Issue: 10 )