Instantaneous Frequency Estimation of Multi-Component Non- Stationary Signals using Fourier Bessel series and Time-Varying Auto Regressive Model

• Autorzy: Ravi Shankar Reddy G. , Rao R.

Identyfikatory

DOI

10.2478/eletel-2015-0048

• Języki publikacji: EN

Abstrakty

EN

In this paper, we propose a novel technique for Instantaneous frequency (IF) estimation of multi component non stationary signals using Fourier Bessel Series and Time-Varying Auto Regressive (FB-TVAR) model. In the proposed technique, the Fourier-Bessel (FB) expansion decomposes the multicomponent non stationary signal into a number of monocomponent signals and TVAR model is used to model each monocomponent signal. In TVAR modeling approach the time varying parameters are expanded as a linear combination of basis functions. In this paper, the TVAR parameters are expanded by a discrete cosine basis functions. The maximum likelihood estimation algorithm for model order selection in TVAR models is also discussed. The Instantaneous frequency (IF) is extracted from the time-varying parameters by calculating the angles of the estimation error filter polynomial roots. The estimation of the TVAR parameters of a multicomponent signal requires the inversion of a large covariance matrix, while the projected technique (FB-TVAR) requires the inversion of a number of comparatively small covariance matrices with better numerical stability properties. Simulation results are presented for three component discrete Amplitude and Frequency modulated (AM-FM)signal.

Słowa kluczowe

EN

basis functions; Fourier-Bessel expansion; instantaneous frequency; multi component non stationary signal; time-varying auto regressive model

• Wydawca: Polish Academy of Sciences, Committee of Electronics and Telecommunication
• Czasopismo: International Journal of Electronics and Telecommunications
• Rocznik: 2015
• Tom: Vol. 61, No. 4
• Strony: 365--376
• Opis fizyczny: Bibliogr. 25 poz., wykr.

Twórcy

autor

Ravi Shankar Reddy G.

• Dept of ECE, CVR College of Engineering, Hyderabad, India

autor

Rao R.

• Jawaharlal Nehru Technological University Hyderabad, India

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