ch3.1b_ssb_vsb - 1 EEN 404 EEN 404 ommunication Systems...

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Unformatted text preview: 1 EEN 404 EEN 404 ommunication Systems ommunication Systems Communication Systems Communication Systems Ch3.1b: Single Ch3.1b: Single-Sideband Modulation Sideband Modulation Vestigial Vestigial-Sideband Modulation Sideband Modulation 2  Single sideband (SSB) modulation 2  motivation: • DSB and AM need twice the message bandwidth • either upper or lower sideband contains the message • SSB only use upper or lower sideband to reduce bandwidth  advantages: • small bandwidth  disadvantages: • cost and complexity of its implementation  modulators: • frequency discrimination method • hase- ift method phase shift method  demodulators: • herent mixing coherent mixing • carrier insertion and envelope detection 3 ilbert Transform (Ch2 9) ilbert Transform (Ch2 9) Hilbert Transform (Ch2.9) Hilbert Transform (Ch2.9)  A filter phase-shifts its input by  Hilbert transform:  Examples: 4 Analytic Signals Analytic Signals  Analytic signal in terms of the real signal x(t) is defined as:  Spectrum of the analytic signal:  For negative frequency part: 5...
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This note was uploaded on 10/28/2010 for the course EEN 404 taught by Professor X.cai during the Spring '10 term at University of Miami.

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ch3.1b_ssb_vsb - 1 EEN 404 EEN 404 ommunication Systems...

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