Radio Transmitters and transmission Fading 20 Mobile communication systems 8 Data transmission systems 6 Digital communications 6 Mathematical models 4 Code division multiple access 3 Multiplexing 3 Design 2 Error analysis (Mathematics) 2 Error-correcting codes (Information theory) 2 Interference 2 Phase shift keying 2 Decoders (Electronics) 1 Digital communication 1 Electrocardiography 1 Long-Term Evolution (Telecommunications) 1 Radio wave propagation 1 Semiconductor storage devices 1 Signal processing 1 Transmitter-receivers 1 Wavelets (Mathematics) 1 Wireless communication systems 1