Single sidebands ssb lathi
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Transcript of Single sidebands ssb lathi
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Single Sidebands SSB
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mul
tiply
by co
s(ωc)
dem
odula
tion LP
F
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Time-Domain Representation of SSB Signals
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4Derivation
H.W.
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Find φSSB (t) for a simple case of a tone modulation, that is, when the modulating signal is a sinusoidal m(t) = cos (ωm t)
Example: Tone Modulation SSB
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Generation of SSB signals
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if A, the carrier amplitude, is large enough, m(t) can be recovered by envelop detection
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Vestigial Sideband VSB
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The BW of VSB signal is 25% to 33% higher than that of SSB signal
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The signal e(t) is passed through the low-pass equalizer filter of transfer function Ho(t)
The output of the equalizer filter is required to be m(t). Hence, the output signal spectrum is given by
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Example