CR	Cognitive radio
CRN	Cognitive radio network
SU	Secondary user
PU	Primary user
SS	Spectrum sensing
CSS	Cooperative spectrum sensing
TBA	Tree-based algorithm
MCE	Minimum classification error
OCC	Optical camera communication
BLE	Bluetooth low energy
ECG	Electrocardiogram
IoT	Internet of things
WBAN	Wireless body area network
UAV	Unmanned aerial vehicle
RL	Reinforcement learning
CI-IoT	Cognitive industrial internet of things
OMA	Orthogonal multiple access
NOMA	Non-orthogonal multiple access
FC-MAC	Fair and cooperative medium access control
SC-BOMP	Sampling-controlled block orthogonal matching pursuit
CSS	Compressive spectrum sensing
CNN	Convolutional neural network
DL	Deep learning
ML	Machine learning
SVM	Support vector machine
VANET	Vehicle ad hoc network
KBL	Kernel-based learning
ROC	Receiver operating characteristic
KNN	K-nearest neighbors
AWGN	Additive white Gaussian noise
PDF	Probability density function
SNR	Signal-to-noise ratio
AI	Artificial intelligence