3/2D	3/2 Dimensions
5G	5th Generation
AoA	Angle of Arrival
ADAM	ADAptive Momentum
AP	Access Points
BLE	Bluetooth Low Energy
C-RAN	Cloud-Radio Access Network
CAE	Convolutional AutoEnconde
CD-1	Contrastive Divergence with one-step iteration
CNN	Convolutional Neural Networks
D2D	device-to-device
DBN	Deep Belief Network
DELTA	DEep Learning cooperaTive Architecture
DNN	Deep Neural Network
DoA	Direction of arrival
GNSS	Global Navigation Satellite System
GPS	Global Positioning System
HetNet	Heterogeneous Network
IoT	Internet of Things
KNN	K-Nearest Neighbor
LOS	Line-Of-Sight
MED	Mean Euclidean Distance
MDPI	Multidisciplinary Digital Publishing Institute
MLP	Multiple Layers Perceptron
mm-Wave	Millimeter Wave
PPDR	Public Protection and Disaster Recovery
PRR	Packet Reception Ratio
RP	Reference Point
RSS	Received Signal Strength
RSSI	Received Signal Strength Indicator
RTI	RSS Temporal Image
RTOF	Return Time of Flight
SNR	Signal-to-Noise-Ratio
SVC	Support Vector Classification
SVM	Support Vector Machine
SVR	Support Vector Regression
TDOA	Time Difference of Arrival
TOA	Time of Arrival
ToF	Time of Flight
V2X	Vehicle-to-Everything
VLC	Visible Light communication
WSN	Wireless Sensors Networks