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Single Sidebands SSB

1

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23

2

mul

tiply

by co

s(ωc)

dem

odula

tion LP

F

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Time-Domain Representation of SSB Signals

3

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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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6

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Generation of SSB signals

7

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8

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9

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10

if A, the carrier amplitude, is large enough, m(t) can be recovered by envelop detection

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11

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Vestigial Sideband VSB

12

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13

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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