Wireless communication systems 40 Mobile communication systems 13 Wireless LANs 12 Personal communication service systems 10 Cellular telephone systems 8 Orthogonal frequency division multiplexing 8 Code division multiple access 7 TCP/IP (Computer network protocol) 7 Technological innovations 7 Computer simulation 6 Security measures 6 Bluetooth technology 5 Standards 5 Computer networks 4 Internet 3 Local area networks (Computer networks) 3 Orthogonalization methods 3 Antenna arrays 2 Artificial satellites in telecommunication 2 Asynchronous transfer mode 2 Extranets (Computer networks) 2 Fiber optics 2 IEEE 802.11 (Standard) 2 MIMO systems 2 Optical communications 2 Radio frequency modulation 2 Space time codes 2 Time division multiple access 2 Wireless Internet 2 Cell phone systems 1