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An architecture for the vlsi design of systems for time-frequency analysis and time-varying filtering

Conception D’une Architecture VLSI pour L’analyse Temps-FréQuence et le Filtrage Variable dans le Temps

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Abstract

A flexible system for time-frequency signal analysis is presented. It is based on the S-method, which has a significant advantage in implementation since it can involve, as a key intermediate step, the Short-time Fourier transform or the Hartley transform, each widely studied and commonly used in practice. Signal invariant and signal dependent system forms are presented. Hardware design, for a fixed-point arithmetic, is well-structured and suitable for vlsi implementation. The same hardware, without additional time requirements, may be shared for the simultaneous realization of the fourth order L-Wigner distribution, as well as for the realization of the cross-terms free fourth order polynomial Wigner-Ville distribution. This possibility makes the designed hardware suitable for wide range of the applications. The proposed hardware is applied to the realization of time-varying filtering, as well. Finally, it has been implemented with fpga chips (Field Programmable Gate Array) in order to verify the results on real devices.

Résumé

Cet article présente un système souple pour l’analyse d’un signal en temps et en fréquence. Ce système est fondé sur la méthode S, ce qui facilite la réalisation grâce àl’emploi de la transformation de Fourier àcourt terme et de la transformation de Hartley, bien connues et largement en usage. L’article considère deux variantes suivant que la fenêtre dépend ou non du signal. La conception du matériel, en arithmétique àvirgule fixe, convient bien àune réalisation par vlsi. Le même matériel peut être utilisé simultanément et sans délai supplémentaire pour la réalisation d’une distribution L-Wigner du quatrième ordre et celle d’une distribution Wigner-Ville polynomiale d’ordre quatre. Le matériel proposé est appliqué àla réalisation de filtrages variables dans le temps. Les résultats ont pu être vérifiés grâce àune réalisation àbase de puces fpga.

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Authors and Affiliations

  1. Elektrotehnicki fakultet, University of Montenegro, 81000, Podgorica, Montenegro

    Srdjan Stanković, Ljubiša Stanković, Veselin Ivanović & Radovan Stojanović

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  1. Srdjan Stanković
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  2. Ljubiša Stanković
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  3. Veselin Ivanović
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  4. Radovan Stojanović
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Correspondence to Srdjan Stanković.

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Stanković, S., Stanković, L., Ivanović, V. et al. An architecture for the vlsi design of systems for time-frequency analysis and time-varying filtering. Ann. Télécommun. 57, 974–995 (2002). https://doi.org/10.1007/BF03005257

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  • DOI: https://doi.org/10.1007/BF03005257

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