(a) What are the drawbacks of DSB+C modulation? For the following message signal, draw the spectra...

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(a) What are the drawbacks of DSB+C modulation? For the following message signal, draw the spectra of DSB-SC, SSB (LSB), and VSB signal. M(f) (2+6) -B 0 B (b) Why DSB-SC signal can not be demodulated non-coherently? With block diagram (2+10) and analytical expression, show how a DSB-SC signal s(t) = m(t)cos(2nfet) can be demodulated coherently. (a) What are the drawbacks of DSB+C modulation? For the following message signal, draw the spectra of DSB-SC, SSB (LSB), and VSB signal. M(f) (2+6) -B 0 B (b) Why DSB-SC signal can not be demodulated non-coherently? With block diagram (2+10) and analytical expression, show how a DSB-SC signal s(t) = m(t)cos(2nfet) can be demodulated coherently. (a) What are the drawbacks of DSB+C modulation? For the following message signal, draw the spectra of DSB-SC, SSB (LSB), and VSB signal. M(f) (2+6) -B 0 B (b) Why DSB-SC signal can not be demodulated non-coherently? With block diagram (2+10) and analytical expression, show how a DSB-SC signal s(t) = m(t)cos(2nfet) can be demodulated coherently. (a) What are the drawbacks of DSB+C modulation? For the following message signal, draw the spectra of DSB-SC, SSB (LSB), and VSB signal. M(f) (2+6) -B 0 B (b) Why DSB-SC signal can not be demodulated non-coherently? With block diagram (2+10) and analytical expression, show how a DSB-SC signal s(t) = m(t)cos(2nfet) can be demodulated coherently.