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Digital Modulation

1 Digital Modulation Digital Modulation David TipperAssociate ProfessorAssociate ProfessorDepartment of Information Science and TelecommunicationsUniversity of Pittsburghhttp:// Communication SystemSourceSource EncoderChannelEncoderModulatorDestinatio nSource DecoderChannelDecoderDemod-ulatorChannel 2 About Channel Capacity Channel Capacity (C) the maximum rate at which data can be transmitted over a given communication path, or channel, under given conditions Data rate (bps) rate at which data can be communicated , impairments, such as noise, limit data rate that can be achieved Bandwidth (B) the bandwidth of the transmitted signal as constrained by the transmitter and the nature of the transmission medium (Hertz) Noise (N)

• Digital data, digital signal – Equipment less complex and expensive than digital -to-analog modulation equipment • Analog data, digital signal – Permits use of modern digital transmission and switching equipme nt • Digital data, analog signal – Some transmission media will only propagate analog signals – E.g., unguided media (air)

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