Abstract
Design of time-frequency distributions (Tfds) that are robust to the impulse noise influence is considered. The robustTfds based on the robust short-time Fourier transform (Stft) are proposed. An efficient procedure to evaluate the robustStft is given. RobustTfds based on the robustStft have better energy concentration around the signal instantaneous frequency (If) than the robustStft itself. Also, theseTfds are more resistant to higher impulse noise than the robustTfds obtained using the local autocorrelation function (Laf) based minimization problem.
Résumé
L’article présente la conception de distributions temps-fréquence robustes en présence de bruit impulsif. Elles sont basées sur la transformée de Fourier à court terme robuste. Une procédure efficace permet de les évaluer. Leur concentration en énergie autour de la fréquence instantanée du signal est meilleure que celle de la transformée de Fourier elle-même. Ces distributions sont aussi plus résistantes à un fort bruit impulsif que celles qui sont obtenues par une minimisation fondée sur une fonction d’autocorrélation locale.
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Djurovic, I., Stanković, L. & Barkat, B. Robust time-frequency distributions based on the robust short time fourier transform. Ann. Télécommun. 60, 681–697 (2005). https://doi.org/10.1007/BF03219942
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DOI: https://doi.org/10.1007/BF03219942
Key words
- Signal theory
- Frequency time representation
- Impulsive noise
- Fourier transformation
- System robustness
- Statistical analysis