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The minimum channel Bandwidth is used by which modulation technique?

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The minimum channel Bandwidth is used by which modulation technique?

(a) VSB

(b) SSB-SC

(c) DSB-SC

(d) AM

This question was posed to me in an interview.

I'm obligated to ask this question of Single Tone Modulation in chapter Amplitude Modulation of Analog Communications

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Correct option is (b) SSB-SC

To explain: A signal has two sidebands which are exactly the mirror images of each other. So we can remove one side band which further reduces its bandwidth. In SSB-SC modulation technique, the carrier is suppressed and only either of the sidebands is transmitted. Thus, SSB-SC has minimum channel Bandwidth.

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