Software radio Wireless communication systems 16 Cognitive radio networks 15 Design and construction 8 Global system for mobile communications 7 Adaptive signal processing 5 Radio 5 Radio frequency allocation 5 Receivers and reception 5 XML (Document markup language) 5 Artificial intelligence 4 Electronic analog computers 4 Electronic circuit design 4 Mobile communication systems 4 Autonomic computing 3 Metal oxide semiconductors, Complementary 3 Radio resource management (Wireless communications) 3 Wireless LANs 3 Antennas (Electronics) 2 Astronautics 2 Broadband communication systems 2 Cellular telephone systems 2 Circuit 2 Circuits 2 Communication systems 2 Communications Engineering, Networks 2 Data processing 2 Digital techniques 2 Engineering 2 Local area networks (Computer networks) 2