CR	Cognitive radio
SU	Secondary users
PU	Primary users
MBSS	Multiband spectrum sensing
SNR	Signal-to-noise ratio
IoT	Internet of things
ED	Energy detector
MRA	Multiresolution analysis
ML	Machine learning
HFD	Higuchi fractal dimension
SDR	Software-defined radio
USRP	Universal software radio peripheral
MIMO	Multiple-input multiple-output
Tx	Transmitters
Rx	Receivers
PSD	Power spectral density
MSPS	Mega samples per second
AWGN	Additive white Gaussian noise
PS	Probability of success
TP	True positive
FN	False negative
FP	False positive
TN	True negative