Channel estimation Genetic algorithm OFDM RBAC Role-based access control Akl Back-propagation neural network Cloud computing Collaboration IoT-based RBAC Contract Contract RBAC Cooperative RBAC Cooperative trust evaluation Datacenter Feature extraction Forcing mutation evolutionary Functional link neural fuzzy network Internet of things LS Least square MC-CDMA MMSE Massive IoT application Minimum mean square error Multi-user detection Neural network Parallel interference cancellation Pulse diagnosis RSA TCM pulse diagnosis