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Find the power saving for DSB-SC wave with 100% modulation?

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in Analog Communications by (122k points)
Find the power saving for DSB-SC wave with 100% modulation?

(a) 66%

(b) 86%

(c) 50%

(d) 33%

I had been asked this question during a job interview.

Query is from Power Calculation in section Amplitude Modulation of Analog Communications

1 Answer

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Correct option is (a) 66%

To explain I would say: In DSB-SC carrier is suppressed.

So Total Power required in DSBSC Modulation = (u^2XPc)/2 = Pc/2

In normal AM, carrier is not suppressed.

So total power required in AM Modulation = (1+(u^2/2))XPc = 3Pc/2

Therefore, Power saving = ((Pc/2)/(3Pc/2)) x 100% = 66%.

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