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Data Encoding Techniques - WPI

Physical Layer Part 2 data Encoding TechniquesNetworks: data Encoding1 Analog and Digital TransmissionsFigure use of both analog and digital transmissions for a computer to computer call. Conversion is done by the modemsand : data Encoding2 data Encoding Techniques Digital data , Analog Signals [modem] Digital data , Digital Signals [wired LAN] Analog data , Digital Signals [codec] Frequency Division Multiplexing (FDM) Wave Division Multiplexing (WDM) [fiber] Time Division Multiplexing (TDM) Pulse Code modulation (PCM) [T1] Delta ModulationNetworks: data Encoding3 Digital data , Analog Signals[Example modem] Basis for analog signaling is a continuous, constant-frequency signal known as thecarrier frequency.

modulation techniques to transmit multiple bits per baud. • Multiple amplitude and multiple phase shifts are combined to transmit several bits per symbol. • QPSK (Quadrature Phase Shift Keying) uses multiple phase shifts per symbol. • Modems actually use Quadrature Amplitude Modulation (QAM). • These concepts are explained using ...

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