NOMA Non-orthogonal 2 Resource allocation 2 Approximation algorithms 1 Cell signaling 1 Cells 1 Compressed sensing 1 Compressed-Sensing 1 Convex optimisation 1 Convex optimization 1 Correlation 1 Cytology 1 Energy efficiency 1 Fourier transforms 1 Free access 1 Genetic algorithms 1 Grant-free access 1 Hybrid power 1 Hybrid power system 1 Hybrid power systems 1 Hybrid systems 1 Hybrid time division multiple access-non-orthogonal multiple access 1 Imperfect SIC 1 Index 1 Interference cancellation 1 Interference management 1 Iterative methods 1 Machinetype communication (MTC) 1 Massive machine-type communication 1 Multi-cell 1