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lecture5 - EEE455/591 EEE455/591 Advanced AM Modulations:...

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Unformatted text preview: EEE455/591 EEE455/591 Advanced AM Modulations: Advanced AM Modulations: SSB, FDM, QCM SSB, FDM, QCM Reading: Textbook Sections 3.2.2, 3.2.3 Reading: Textbook Sections 3.2.2, 3.2.3 Review: Coventional AM Review: Coventional AM Topics: Topics: 1. 1. How to Generate Conventional AM How to Generate Conventional AM 2. 2. Single Side Band (SSB) AM Single Side Band (SSB) AM 3. 3. Frequency Division Multiplexing (FDM) Frequency Division Multiplexing (FDM) 4. 4. Quadrature-Carrier Multiplexing (QCM) Quadrature-Carrier Multiplexing (QCM) Review Conventional AM dt t m T P where P a A A P T T m m c c u n 2 2 / 2 / 2 2 2 )] ( [ 1 lim 2 2 - = + = Conventional AM uses bandwidth of 2W with a carrier impulse: Spectrum of Conventional AM For DSB-SC (suppressed carrier), the modulated signal power is For Conventional AM, the modulated power is Modulation efficiency is Signal to noise ratio is Thermal noise =kT=-204 dBW per hertz at 300 degree Kelvin ) 2 cos( )] ( 1 [ ) ( c c c t f t m A t u + + = f m c u P A P 2 2 = m m P a P a 2 2 1 + = W N P N S u = 1. How to Generate Conventional AM?1....
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This note was uploaded on 11/01/2009 for the course EEE 455 taught by Professor Hui during the Spring '09 term at ASU.

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lecture5 - EEE455/591 EEE455/591 Advanced AM Modulations:...

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