Cellular radio Mobile communication systems 14 Wireless communication systems 11 Radio wave propagation 5 Signal theory (Telecommunication) 5 Global system for mobile communications 4 Personal communication service systems 4 Artificial satellites in telecommunication 3 Local area networks (Computer networks) 3 Packet transmission 3 Radio 3 Cellular telephone systems 2 Cellular telephones 2 Design and construction 2 Radio frequency 2 Radio frequency allocation 2 Code division multiple access 1 Design 1 Developing countries 1 Dictionaries, Polyglot 1 Economic aspects 1 developing countries 1