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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 dTransm

6 FM and PM differences FM: instantaneous frequency deviation from the carrier frequency is proportional to m(t) 2 1 ( ) 2 1 fd (t) fi (t) fc t Df m t ... 2.082 10 −5 × 2.603 10 −7 × 2.603 10 ...

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