SourceEncoding(Compression)ChannelEncoding(Error correcting codes)Modulation(e.g., PSK, QAM)RF Circuit(Filters,Up-Converter,Amplifiers)DataDAC(Digital-to-Analog Converter)RF Circuit(Filters,Down-Converter,Amplifiers)ADC(Analog-to-Digital Converter)DemodulationSource DecodingData(hopefully)ChannelDecodingWirelessChannelTX AntennaSynchronization and other processing often happens hereRX Antenna