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lecture5 - EEE455/591 EEE455/591 Advance AM Modulations d S...

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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 GenerateConventional AM How to GenerateConventional AM 2. 2. SingleSideBand (SSB) AM SingleSideBand (SSB) AM 3. 3. Frequency Division Multiplexing (FDM) Frequency Division Multiplexing (FDM) 4. 4. Quadrature-Carrier Multiplexing (QCM) Quadrature-Carrier Multiplexing (QCM)
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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), themodulated signal power is For Conventional AM, themodulated power is Modulation efficiency is Signal to noiseratio is Thermal noise=kT=-204 dBW per hertz at 300 degreeKelvin ) 2 cos( )] ( 1 [ ) ( c c c t f t m A t u θ π + + = f m c u P A P 2 2 = m m P a P a 2 2 1 + = η W N P N S u 0 η =
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1. How to GenerateConventional AM?
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