Wireless communication systems Mobile communication systems 13 Broadband communication systems 7 Antennas (Electronics) 6 Equipment and supplies 6 Code division multiple access 4 Design and construction 4 Microwave communication systems 3 Radio circuits 3 Standards 3 Computer network protocols 2 Computer networks 2 Design 2 Internetworking (Telecommunication) 2 Microwave circuits 2 Mobile computing 2 Radio 2 Radio frequency 2 Research 2 Ultra-wideband devices 2 Artificial satellites in telecommunication 1 Cellular telephone systems 1 Computational intelligence 1 Computer algorithms 1 Computer-aided design 1 Convergence (Telecommunication) 1 Cryptography 1 Digital techniques 1 Distributed processing 1 Economic aspects 1