CR	Cognitive Radio
SU	Secondary User
PU	Primary User
SS	Spectrum Sensing
ML	Machine Learning
RB	Resource Block
ED	Energy Detection
ELM	Extreme Learning Machine
SVM	Support Vector Machine
NB	Naive Bayes
kNN	k-Nearest Neighbors
RF	Random Forest
EV	Energy Vector
DT	Decision Tree
AWGN	Additive White Gaussian Noise
EPA	Extended Pedestrian A model
SNR	Signal-to-Noise Ratio
LTE	Long-Term Evolution
OFDM	Orthogonal Frequency Division Multiplexing