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Unformatted text preview: EEE455/ 591 EEE455/ 591 Amplitude Modulation & Demodulation Amplitude Modulation & Demodulation Conventional AM Conventional AM Reading: Textbook Sections 3.2.2, 3.2.3 Reading: Textbook Sections 3.2.2, 3.2.3 Review: Computing Power for AM Signals Review: Computing Power for AM Signals Topics: Topics: 1. 1. Conventional AM Conventional AM 2. 2. Modulation I ndex of Conventional AM Modulation I ndex of Conventional AM 3. 3. Demodulation of DSB-SC AM Demodulation of DSB-SC AM 4. 4. Power Content of Conventional AM Power Content of Conventional AM ( 29 4 4 4 4 1 ) ( * ) ( 1 4 ) ( 2 2 ) ( 2 ) ( 2 ) ( 2 ) ( 2 × = × = = + + + = ∫ +---- + B A T B A T dt t u t u T P e e e e B A t u c c T u t f f j t f f j t f f j t f f j c m c m c m c m c π π π π Review: Computing Power in AM Signals f-fc-fm-fc+fm fc-fm fc+fm A c B/ 4 A c B/ 4 A c B/ 4 A c B/ 4 • How do we compute power in a signal? • To calculate the average power of u(t): P u = ( ∫ T | u(t)| 2 dt )/ T • | u(t)| 2 = u(t)u*(t) where * represents complex conjugate....
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- Spring '09
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