chapter_3_part_4 - Chapter 3 Analog Signal Transmission and...

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Chapter 3: Analog Signal Transmission and Reception Part IV Dr. Barış Atakan 1
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Angle Modulation: Spectral Characteristics In general, for a sinusoidal message signal, the effective bandwidth of an angle-modulated signal , which contains at least 98% of the signal power, is given by the relation where β is the modulation index and f m is the frequency of the sinusoidal message signal. Let the message signal be given by The effective bandwidth of the modulated signal is given by 2
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Angle Modulation: Spectral Characteristics The number of harmonics in the bandwidth (including the carrier) Increasing the amplitude a increases the number of harmonics in the bandwidth of the modulated signal in both cases Increasing f m , has no effect on the number of harmonics in the bandwidth of the PM signal and decreases the number of harmonics in the FM signal almost linearly 3
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Angle Modulation: Spectral Characteristics 4
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Angle Modulation: Spectral Characteristics 5 For a general nonperiodic deterministic message signal m(t) , there exists an approximate relation for the effective bandwidth of the modulated signal,
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