Izvorni znanstveni članak
Detecting the number of components in a non-stationary signal using the Rényi entropy of its time-frequency distributions
Dragan Korač
; Tehnički fakultet,Sveučilišta u Rijeci, Rijeka, Hrvatska
Nicoletta Saulig
; Tehnički fakultet,Sveučilišta u Rijeci, Rijeka, Hrvatska
Viktor Sučić
; Tehnički fakultet,Sveučilišta u Rijeci, Rijeka, Hrvatska
Damir Seršić
; Fakultet elektrotehnike i računarstva, Sveučilište u Zagrebu, Zagreb, Hrvatska
Srđan Stanković
; Elektrotehnički fakultet, Univerzitet Crne Gore, Podgorica, Crna Gora
Sažetak
A time-frequency distribution provides many advantages in the analysis of multicomponent non-stationary signals. The simultaneous signal representation with respect to the time and frequency axis defines the signal amplitude, frequency, bandwidth, and the number of components at each time moment. The Rényi entropy, applied to a time-frequency distribution, is shown to be a valuable indicator of the signal complexity. The aim of this paper is to determine which of the treated time-frequency distributions (TFDs) (namely, the Wigner-Ville distribution, the Choi-Williams distribution, and the spectrogram) has the best properties for estimation of the number of components when there is no prior knowledge of the signal. The optimal Rényi entropy parameter α is determined for each TFD. Accordingly, the effects of different time durations, bandwidths and amplitudes of the signal components on the Rényi entropy have been analysed. The concept of a class, when the Rényi entropy is applied to TFDs, is also introduced.
Ključne riječi
nonstationary signals; time-frequency distributions; Rényi entropy
Hrčak ID:
78566
URI
Datum izdavanja:
19.3.2012.
Posjeta: 1.264 *