Positive Time-Frequency Distributions via Quadratic Programming
Multidimensional Systems and Signal Processing - Special issue on recent developments in time-frequency analysis
CT image reconstruction approaches applied to time-frequency representation of signals
EURASIP Journal on Applied Signal Processing
The self-duality of discrete short-time Fourier transform and its applications
IEEE Transactions on Signal Processing
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The authors study the formulation of members of the Cohen-Posch (1985) class of positive time-frequency energy distributions. Minimization of cross-entropy measures with respect to different priors and the case of no prior or maximum entropy were considered. They conclude that, in general, the information provided by the classical marginal constraints is very limited, and thus, the final distribution heavily depends on the prior distribution. To overcome this limitation, joint time and frequency marginals are derived based on a “direction invariance” criterion on the time-frequency plane that are directly related to the fractional Fourier transform