ch3.1b_ssb_vsb - 1 EEN 404 Communication Systems Ch3.1b...

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1 EEN 404 Communication Systems Ch3.1b: Single Ch3.1b: Single-Sideband Modulation Sideband Modulation Vestigial Vestigial-Sideband Modulation Sideband Modulation
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2 Single sideband (SSB) modulation motivation: • DSB and AM need twice the message bandwidth i h l id b d i h • either upper or lower sideband contains the message • SSB only use upper or lower sideband to reduce bandwidth d advantages: • small bandwidth di d t disadvantages: • cost and complexity of its implementation d l t modulators: • frequency discrimination method •phase-shift method phase shift method demodulators: •coherent mixing coherent mixing • carrier insertion and envelope detection
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