Abbreviations
AWGN	Additive white Gaussian noise
TFD	Time-frequency distribution
DFT	Discrete Fourier transform
TF	Time-frequency
LRE	Local Rényi entropy
SNR	Signal-to-noise ratio
Nomenclature
$A_l$	instantaneous amplitude of the l-th component
$\mathbf{C}$	set of observations derived from a TFD
${\mathbf{C}}_{\mathbf{t}}$	set of observations derived from one TFD building block
$C_I$	subset of TFD’s observations derived from useful information
$C_k$	k-th set of partitioned TFD’s observations
$C_{k,t}$	k-th set of partitioned observations from one TFD building block
$d_k$	closeness value between LRE estimates $H_k$ and $H_{k+1}$
$d_k$	closeness value between block-wise LRE estimates $H_{k,t}$ and $H_{k+1,t}$
f	continuous frequency
$f_l\left(t\right)$	instantaneous frequency of the l-th component
$f_s$	sampling frequency
G	time-lag kernel
$H_k$	Rényi entropy of the k-th TFD class
$H_{k,t}$	Rényi entropy of the k-th class, and t-th building block
i	smallest index of useful classes ${\rho }_k$
$i_t$	smallest index of building-block useful classes ${\rho }_{k,t}$
L	number of signal components
K	number of TFD classes
l	discrete lag
m	discrete frequency
M	number of frequency bins
n	discrete time
$n_0$	parameter defining the amplitude modulation time-shift
N	number of time samples
p	specific time instant
t	continuous time
T	parameter defining the signal component amplitude modulation variance
$UI$	extracted TFD useful information
$U{I}_t$	useful information extracted per one TFD building-block
w	non-constant positive noise amplitude modulation
$x_l$	l-th signal component
x	noise-free signal
y	noisy signal
$\alpha$	Rényi entropy order
$\beta$	parameter defining the amplitude noise modulation variance
$\Delta m$	frequency resolution
$\Delta n$	duration of LRE estimation interval
$\Delta t$	duration of one TFD building block
$\nu$	additive white noise
$\rho$	quadratic TFD
${\rho }_I$	TFD of extracted useful information
${\rho }_k$	k-th TFD class
${\rho }_{k,t}$	k-th class of TFD building block
${\rho }_t$	TFD building block
${\rho }_y$	TFD of a noisy signal
$\tau$	continuous lag
${\Phi }_l$	instantaneous phase of the l-th component