Code division multiple access Mobile communication systems 5 Wireless communication systems 5 Radio 4 Spread spectrum communications 4 Fading 3 Transmitters and transmission 3 Access control 2 Antenna arrays 2 Computer simulation 2 Optical communications 2 Adaptive filters 1 Asynchronous circuits 1 Cell phone systems 1 Data transmission systems 1 Design 1 Design and construction 1 Detectors 1 Electromagnetic interference 1 Error analysis (Mathematics) 1 Fault location (Engineering) 1 Interference 1 Mathematical models 1 Metropolitan area networks (Computer networks) 1 Multichannel communication 1 Orthogonal frequency division multiplexing 1 Packet switching (Data transmission) 1 Prevention 1 Radio frequency 1 Radio noise 1