Multiscale approximate eigenvectors for multivariate self-similarity estimation
(2025) 33rd European Signal Processing Conference, EUSIPCO 2025 In European Signal Processing Conference p.2617-2621- Abstract
Many real-world systems generate multivariate time series data, often exhibiting self-similarity and scale-invariance across different modalities. The estimation of Hurst exponents in such settings is crucial for analyzing long-range dependencies. Yet, traditional eigenanalysis-based methods suffer from scale-dependent distortions, particularly in the presence of scaling amplitude discrepancies. In this work, we propose a novel multiscale eigenanalysis approach that leverages joint diagonalization of wavelet random matrices to improve estimation accuracy. By approximating a common eigenvector basis across multiple scales, our method mitigates the limitations of scale-wise eigenvalue regressions and provides robust estimation of... (More)
Many real-world systems generate multivariate time series data, often exhibiting self-similarity and scale-invariance across different modalities. The estimation of Hurst exponents in such settings is crucial for analyzing long-range dependencies. Yet, traditional eigenanalysis-based methods suffer from scale-dependent distortions, particularly in the presence of scaling amplitude discrepancies. In this work, we propose a novel multiscale eigenanalysis approach that leverages joint diagonalization of wavelet random matrices to improve estimation accuracy. By approximating a common eigenvector basis across multiple scales, our method mitigates the limitations of scale-wise eigenvalue regressions and provides robust estimation of multivariate self-similarity parameters. We demonstrate the effectiveness of our approach through extensive Monte Carlo simulations, showcasing improved performance over traditional methods in both orthogonal and non-orthogonal mixing scenarios. These findings establish joint eigenvector-based wavelet analysis as a powerful tool for multivariate self-similarity estimation.
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- author
- Wendt, Herwig ; Didier, Gustavo ; Carlsson, Marcus LU ; Troedsson, Erik LU and Abry, Patrice
- organization
- publishing date
- 2025
- type
- Chapter in Book/Report/Conference proceeding
- publication status
- published
- subject
- keywords
- Hurst exponent, joint diagonalization, multivariate self-similarity, random matrices, wavelets
- host publication
- 2025 33rd European Signal Processing Conference, EUSIPCO 2025 - Proceedings
- series title
- European Signal Processing Conference
- pages
- 5 pages
- publisher
- European Signal Processing Conference, EUSIPCO
- conference name
- 33rd European Signal Processing Conference, EUSIPCO 2025
- conference location
- Palermo, Italy
- conference dates
- 2025-09-08 - 2025-09-12
- external identifiers
-
- scopus:105029865734
- ISSN
- 2219-5491
- ISBN
- 9789464593624
- DOI
- 10.23919/EUSIPCO63237.2025.11226404
- language
- English
- LU publication?
- yes
- additional info
- Publisher Copyright: © 2025 European Signal Processing Conference, EUSIPCO. All rights reserved.
- id
- 84efbe67-a470-4f51-84ac-fbc4d095559d
- date added to LUP
- 2026-03-10 14:41:10
- date last changed
- 2026-03-10 14:41:55
@inproceedings{84efbe67-a470-4f51-84ac-fbc4d095559d,
abstract = {{<p>Many real-world systems generate multivariate time series data, often exhibiting self-similarity and scale-invariance across different modalities. The estimation of Hurst exponents in such settings is crucial for analyzing long-range dependencies. Yet, traditional eigenanalysis-based methods suffer from scale-dependent distortions, particularly in the presence of scaling amplitude discrepancies. In this work, we propose a novel multiscale eigenanalysis approach that leverages joint diagonalization of wavelet random matrices to improve estimation accuracy. By approximating a common eigenvector basis across multiple scales, our method mitigates the limitations of scale-wise eigenvalue regressions and provides robust estimation of multivariate self-similarity parameters. We demonstrate the effectiveness of our approach through extensive Monte Carlo simulations, showcasing improved performance over traditional methods in both orthogonal and non-orthogonal mixing scenarios. These findings establish joint eigenvector-based wavelet analysis as a powerful tool for multivariate self-similarity estimation.</p>}},
author = {{Wendt, Herwig and Didier, Gustavo and Carlsson, Marcus and Troedsson, Erik and Abry, Patrice}},
booktitle = {{2025 33rd European Signal Processing Conference, EUSIPCO 2025 - Proceedings}},
isbn = {{9789464593624}},
issn = {{2219-5491}},
keywords = {{Hurst exponent; joint diagonalization; multivariate self-similarity; random matrices; wavelets}},
language = {{eng}},
pages = {{2617--2621}},
publisher = {{European Signal Processing Conference, EUSIPCO}},
series = {{European Signal Processing Conference}},
title = {{Multiscale approximate eigenvectors for multivariate self-similarity estimation}},
url = {{http://dx.doi.org/10.23919/EUSIPCO63237.2025.11226404}},
doi = {{10.23919/EUSIPCO63237.2025.11226404}},
year = {{2025}},
}