lecture6

lecture6 - Lecture Outline Phase Modulation and Frequency...

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Lecture Outline Phase Modulation and Frequency Modulation Reading: Text section 3.3. Skip section 3.3.2 Material covered: 1. Frequency Modulation (FM) and Phase Modulation (PM)- Angle Modulation: Transmit the message in the frequency or the phase of the carrier, not the amplitude! Use extensively in: FM radio Audio part of TV broadcasting First generation analog cellular phones Result: Constant envelope modulated signal: Advantages: Improved noise immunity Power efficient as amplifiers are most efficient in saturation mode. Immune to distortion in amplitude. Disadvantages: Takes more bandwidth than AM More complex transceivers. Frequency Modulation: The message modulates the frequency of the carrier. Phase Modulation: The message modulates the phase of the carrier. 1
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2. Description of PM and FM Modulation: Phase modulation (PM): )) ( 2 cos( ) ( t m k t f A t u p c c + = π Frequency Modulation (FM): ) ) ( 2 cos( )
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lecture6 - Lecture Outline Phase Modulation and Frequency...

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