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Sideband Modulations

Sideband Modulations. Reduction in transmitted power Reduction in Bandwidth (B) Reduction in kTB Sideband modulators are more complex Sideband demodulators can be extremely complex. Alphabet Soup. __SB - __C. (Side Band). (Carrier). S : Single D : Double V : Vestigial. F : Full

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Sideband Modulations

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  1. Sideband Modulations • Reduction in transmitted power • Reduction in Bandwidth (B) • Reduction in kTB • Sideband modulators are more complex • Sideband demodulators can be extremely complex

  2. Alphabet Soup __SB - __C (Side Band) (Carrier) S : Single D : Double V : Vestigial F : Full R : Reduced S : Suppressed

  3. Vestigial Sideband VSB Filter + x e(t) (Vestigial Side Band) a(t) + cos(wct) 1 wc • Less Transmitted Bandwidth • Most of lower sideband power eliminated • Less Carrier Power wc

  4. VSB Receiver IF Compensation Low Frequency Content in LSB wIF VSB Compensation Filter de-emphasizes the additional low frequency content introduced by the LSB

  5. DSB - SC + Low Pass Filter x a(t) e(t) + cos(wct) 1 • Same Transmitted Bandwidth • Zero Carrier Power • Generate with Double balanced Mixer (no offset) wc 3wc 5wc

  6. MC1596 Analog Multiplier G+ = kS+ , and G- = kS- -Vo(+) = (C+ - C-)G- + (C- - C+)G+ -Vo(-) = (C+ - C-)G + + (C- - C+)G- Vo(+) - Vo(-) = -2[(C+ - C-)G- + (C- - C+)G+] =2(C- - C+)(G+ - G-) But C- = - C+ , S- = - S+ Vo(+) - Vo(-) = 8kS+C+ G - G +

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