chapter_3_part_3 - Chapter 3 Analog Signal Transmission and...

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Chapter 3: Analog Signal Transmission and Reception Part III Dr. Barış Atakan 1
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Angle Modulation: Frequency and Phase Modulation In frequency-modulation (FM) systems, the frequency of the carrier f c is changed by the message signal In phase-modulation (PM) systems, the phase of the carrier is changed according to the variations in the message signal Due to their inherent nonlinearities , the FM and PM are more complex to implement , and much more difficult to analyze. In many cases only an approximate analysis can be done 2
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Angle Modulation: Frequency and Phase Modulation Another property of angle modulation is its bandwidth- expansion property The effective bandwidth of the modulated signal is usually many times the bandwidth of the message signal ( actaully infinite ) The major benefit of these systems is their high degree of noise immunity Trade-off bandwidth for high noise immunity The noise immunity is the reason why FM systems are widely used in high-fidelity music broadcasting and point-to-point communication systems where the transmitter power is quite limited. 3
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Angle Modulation: Representation of FM and PM Signals An angle-modulated signal in general can be written as The instantaneous frequency f i (t) is given by ) ( 2 ) ( where , ) ( cos ) ( t f t t A t u c c 4
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Angle Modulation: Representation of FM and PM Signals If m(t) is the message signal, then in a PM system we have In an FM system, we have k p and k f are the phase and frequency deviation constants 5
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Angle Modulation:
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