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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)

8 Binary Frequency -Shift Keying (BFSK) • Two binary digits represented by two different frequencies near the carrier frequency – where f 1 and f 2 are offset from carrier frequency f c by equal but opposite amounts – B = 2([f

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