Question

Amplitude modulation (broadcast AM) is used to modulate signal to transmit message m1(t), with a modulation indexu=0.75, based upon a carrier with frequency 100 kHz. a. What amplitude of the

carrier is added to get this µ? b. Write an expression for 02(t)=DAM(t) – you can leave it in terms of m1(t) c. Find the bandwidth, BT2 , of this modulated signal - 32000 Hz d. Estimate the power efficiency of this signal - the ratio of the sideband power to the total power of the modulatedsignal. (Hint: Intelligent guesstimations will work on this or you can do more work) e. Can an envelope detector be used to demodulate? If no, what needs to change? If yes, name a good RC value thatwould work.

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