Function of transmitter 1) signal processor In analog system it may be an analog low- pass filter In hybrid one, it may be analog to-digital converter(ADC) 2)Function of signal-processing block in hybrid one Source coding Channel coding(adding parity and others) 3)Function of Carrier Circuits modulation ll
11 1) signal processor In analog system it may be an analog lowpass filter; In hybrid one, it may be analogto-digital converter(ADC) 2)Function of signal-processing block in hybrid one Source coding Channel coding(adding parity and others) 3) Function of Carrier Circuits modulation Function of transmitter
Channel 1 Classification: wire and wireless Wire channel including twisted-pair telephone e line/Coaxial cables, waveguides and fiber-optic cables Wireless channel having air vacuum and seawater 2) Note: The general principles of digital and analog modulation apply to all types of channels, although channel characteristics may impose constraints that favor a particular type of I. signaling 12
12 1） Classification: wire and wireless Wire channel including twisted-pair telephone line/Coaxial cables,waveguides and fiber-optic cables Wireless channel having air,vacuum and seawater 2) Note: The general principles of digital and analog modulation apply to all types of channels, although channel characteristics may impose constraints that favor a particular type of signaling Channel