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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) impairments on the communications path Error rate -rate at which errors occur (BER) Error = transmit 1 and receive 0.

• λ= wavelength = c/f , where c = speed of light, f= frequency. • 3000Hz baseband signal => 15 mile antenna, 900 MHz => 8 cm – Frequency Division Multiplexing – provides separation of signals – medium characteristics – Interference rejection – Simplifying circuitry • Modulation

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