Cognitive radio networks Software radio 4 Wireless communication systems 4 Radio frequency allocation 3 Ad hoc networks (Computer networks) 2 Design and construction 2 Multiuser detection (Telecommunication) 2 more ... Antennas (Electronics) 1 Artificial satellites in telecommunication 1 Distributed artificial intelligence 1 Internetworking (Telecommunication) 1 Local area networks (Computer networks) 1 MIMO systems 1 Management 1 Mathematical models 1 Radio resource management (Wireless communications) 1 Self-organizing systems 1 Signal processing 1 Telecommunication policy 1 Wide area networks (Computer networks) 1 less ...