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What is the bandwidth required in SSB signal?

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What is the bandwidth required in SSB signal?

(a) fm

(b) 2fm

(c) > 2fm

(d) < 2fm

The question was posed to me in final exam.

This interesting question is from Heterodyne Receiver in chapter Receivers & Transducers of Analog Communications

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Right choice is (a) fm

For explanation: In an AM modulated system, total bandwidth required is from fc + fm to fc – fm i.e. bandwidth is equal to 2fm. In SSB-SC transmission, the carrier and one of the sideband gets suppressed, so the bandwidth becomes fm only.

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