Communication Fundamentals

May 2nd, 2015
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CONTINUOUS-WAVE MODULATION SCHEMES: AMPLITUDE MODULATION (AM) • Double sideband amplitude modulation (DSB) • Frequency spectrum and power relationships of the AM signal • Modifications of amplitude modulation

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Communication FundamentalsThe Hong Kong Polytechnic UniversityEIE331: Communication FundamentalsFile name: eie331 03am.pdfCONTINUOUS-WAVE MODULATION SCHEMES:AMPLITUDE MODULATION (AM) Double sideband amplitude modulation (DSB) Frequency spectrum and power relationships of the AM signal Modications of amplitude modulation: Double sideband suppressed carrier (DSBSC) Vestigial sideband modulation (VSB) Single sideband modulation (SSB) Frequency-division multiplexing (FDM)Gza KOLUMBAN Dept. of Electronic and Information Engineering e1The Hong Kong Polytechnic UniversityEIE331: Communication FundamentalsReferences for amplitude modulation:Haykin: Sections 3.13.7, pp. 121151Sections 3.9, pp. 152154Lecture notesTutorial notesRemark: Implementation and operation of envelope detector coherent detectorwill be discussed at the tutorial lecture.Gza KOLUMBAN Dept. of Electronic and Information Engineering e2The Hong Kong Polytechnic UniversityEIE331: Communication FundamentalsCONTINUOUS-WAVE MODULATIONContinuous-wave (CW) modulation means that some characteristic of a sinusoidal carrier is varied in accordance with the message (modulating) signal. Sinusoidal carrier:c(t) = a(t) cos[i(t)] = a(t) cos[c(t)t + c(t)] where c(t) = 2fc(t) 1i (t)where a(t), i(t) and fi(t) = 2 ddt are the instantaneous amplitude, phase and frequency, respectively, of the carrierVarie

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