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FM- Frequency Modulation PM - Phase Modulation

11FM- Frequency ModulationPM - Phase ModulationEELE445-14 Lecture 30 DSB-SC, AM, FM and PM()[] == =+==tfpdmjDctmjDcccceAtgeAtgtmjtmAtgtmAt gtmAtg )()()()()( )()()(1)()()( :EnvelopeComplex FM :EnvelopeComplex PM :EnvelopeComplex SC-SSB :EnvelopeComplex AM :EnvelopeComplex SC-DSB2FM and PM[][])(cos)(Re)()()()()()()(ttAetgtsAtg tReAetRtgcctjctjctjc +== ====:signal modulated-angle dTransmitteconstantis power constant ais envelope real the EnvelopeComplex FM and PM[][]voltHzDvoltradDdmDtvoltradDtmDtttA etgtsfftfppcctjc 2sec)()()()()(cos)(Re)(= = =+== constant Modulation or deviation Frequency :FM for constant Modulation or ysensitivit Phase :PM for:signal modulated-angle dTransmitte3FM and PMRelationship between mf(t) and mp(t): dmDDtmdttdmDDtmtfpfppfpf = =)()()()(Couch, Digital and Analog Communication Systems, Seventh Edition 2007 Pearson Education, Inc.

1 1 FM- Frequency Modulation PM - Phase Modulation EELE445-14 Lecture 30 DSB-SC, AM, FM and PM [] = ∫−∞ = ± = + = t f p jD m d c jD m t c c c c g t A e g t A e g t A m t jm t

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