COMPARISON AND APPLICATION OF SOME TIME-FREQUENCY DISTRIBUTIONS BELONGING TO COHEN CLASS

2003 ◽  
Vol 39 (08) ◽  
pp. 129 ◽  
Author(s):  
Ming Jiang
Keyword(s):  
Frequency Distributions ◽  
Time Frequency ◽  
Cohen Class

Pseudo Cohen Time-Frequency Distributions in Infinite Variance Noise Environment

2013 ◽  
Vol 475-476 ◽  
pp. 253-258
Author(s):  
Hai Bin Wang ◽  
Jun Bo Long ◽  
Dai Feng Zha
Keyword(s):  
Order Statistic ◽  
Stable Distribution ◽  
Impulsive Noise ◽  
Infinite Variance ◽  
Frequency Distributions ◽  
Time Frequency ◽  
Noise Environment ◽  
Class Distribution ◽  
Cohen Class ◽  
Low Order

stable distribution has been suggested as a more appropriate model in impulsive noise environment.The performance of conventional time-frequency distributions (TFDs) degenerate in stable distribution noise environment. Hence, three improved methods are proposed based on Fractional Low Order statistics, Fractional Low Order Wigner-Ville Distribution (FLO-WVD), Fractional Low Order Statistic pseudo Wigner-Ville Distribution (FLO-PWVD), Fractional Low Order Statistic Cohen class distribution (FLO-Cohen). In order for real-time, on-line operation and fairly long signals processing, a new smoothed pseudo Fractional Low Order Cohen class distribution (PFLO-Cohen) is proposed.Simulations show that the methods demonstrate the advantages in this paper, are robust.

A Time-Frequency Distribution for Analysis of Signals with Transient Components and Its Application to Vibration Analysis

1999 ◽  
Vol 121 (3) ◽  
pp. 328-333 ◽  
Author(s):  
G. T. Zheng ◽  
P. D. McFadden
Keyword(s):  
Frequency Distribution ◽  
Wigner Distribution ◽  
Vibration Signals ◽  
Frequency Distributions ◽  
Time Frequency ◽  
Frequency Domains ◽  
Harmonic Components ◽  
Cohen Class ◽  
New Distribution ◽  
Time Frequency Distribution

Bilinear time-frequency distributions, which provide simultaneous high resolution in both time and frequency domains, offer advantages for the analysis of vibration signals where the harmonic components and sidebands may be closely spaced. However, the Choi-Williams exponential distribution is found to be unsuitable, and aliasing produced by distributions of the Cohen class also causes problems. An aliasfree exponential time-frequency distribution is introduced, which combines features of distributions of the Cohen class and the generalized Wigner distribution. The new distribution is shown to be well suited to the analysis of signals with transient components.

A deductive construction of third-order time-frequency distributions

1994 ◽  
Vol 36 (3) ◽  
pp. 277-286 ◽  
Author(s):  
Pierre-Olivier Amblard ◽  
Jean-Louis Lacoume
Keyword(s):  
Third Order ◽  
Frequency Distributions ◽  
Time Frequency
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