Single sidebands ssb lathi

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Single sidebands ssb lathi

  1. 1. Single Sidebands SSB Friday, November 30, 20121
  2. 2. Friday, November 30,2 2012
  3. 3. Time-Domain Representationof SSB Signals Friday, November 30, 2012 3
  4. 4. H.W.Derivation Friday, November 30, 2012 4
  5. 5. Example: Tone Modulation SSBFind φSSB (t) for a simple case of a tone modulation, that is, when themodulating signal is a sinusoidal m(t) = cos (ωm t) Friday, November 30, 2012 5
  6. 6. Friday, November 30, 20126
  7. 7. Generation of SSB signals Friday, November 30, 2012 7
  8. 8. Friday, November 30, 20128
  9. 9. Friday, November 30, 20129
  10. 10. Friday, November 30, 2012if A, the carrier amplitude, is large enough, m(t) can berecovered by envelop detection 10
  11. 11. Friday, November 30, 201211
  12. 12. VSB Vestigial Sideband Friday, November 30, 201212
  13. 13. Friday, November 30, 201213
  14. 14. Friday, November 30, 2012The BW of VSB signal is 25%to 33% higher than that ofSSB signal 14
  15. 15. The signal e(t) is passed through the low-pass equalizer filter of transfer functionHo(t) Friday, November 30, 2012The output of the equalizer filter is required to be m(t). Hence, the output signalspectrum is given by 15
  16. 16. Example Friday, November 30, 201216

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