Acronym	Description	Acronym	Description
1G	First generation	G-RQ	Generalized Rayleigh quotient
2G	Second generation	GSM	Global system for mobile
3G	Third generation	HD	Half-duplex
4G	Fourth generation	HetNet	Heterogeneous network
5G	Fifth generation	H-NOMA	Hybrid NOMA
AF	Amplify and forward	ICA	Interference channel alignment
AR	Augmented reality	IQF	Indefinite quadratic form
BA	Buffer aided	JD	Joint-diagonalization
BER	Bit error rate	LDS	Low-density spreading
BRS	Best relay selection	LoS	Line-of-sight
BS	Base station	M2M	Machine-to-machine
CA	Carrier aggregation	MA	Multiple access
CBF	Coordinated beamforming	MISO	Multiple-input single-output
CCI	Co-channel interference	mmWave	Millimeter wave
CDF	Cumulative distribution function	MPA	Message passing algorithm
CDI	Channel distribution information	MRC	Maximum ratio combining
CDMA	Code division multiple access	MRT	Maximum ratio transmission
CEEs	Channel estimation errors	NNC	Noisy network coding
CF	Compress-and-forward	OP	Outage probability
CFR	Cooperative full-duplex relaying	PACs	Power allocation coefficients
CoMP	Coordinated multipoint	PAPR	Peak-to-average-power ratio
CR	Cooperative relaying	PD	Power domain
C-RAN	Cloud radio access network	PDF	Probability density function
CRS	Cooperative relay selection	PH	Projection hybrid
DDF	Dynamic decode and forward	PLC	Power line communication
DF	Decode-and-forward	PLS	Physical layer security
DL	Downlink	QoS	Quality of service
DPC	Dirty parity coding	QPSK	Quadrature phase-shift keying
DRS	Dynamic relay selection	RBC	Relaying broadcast channel
EE	Energy efficiency	R-D	Relay-to-destination
EH	Energy harvesting	RF	Radio frequency
eMBB	Enhanced mobile broadband	RHIs	Residual hardware impairments
EMC	Electromagnetic compatibility	SA	Signal alignment
ESC	Ergodic sum capacity	SC	Superposition coding
FD	Full-duplex	SCMA	Sparse code multiple access
FDD	Frequency-division duplex	SINR	Signal-to-interference-plus-noise ratio
FDR	Full duplex relaying	SLNR	Signal-to-leakage-plus-noise ratio
FFR	Fractional frequency reuse	SM	Spatial modulation
FPA	Fixed power allocation	ZFBF	Zero-forcing beamforming