Q(3) [25 marks] YOUR ANSWER SHOULD BE ON PAGE 4 ON BOTH SIDES (a) The modulating signal m(t) = Em cos wmt is modulated by the carrier signal c(t) = E, cos wet. Determine, using the phasing method, the LSB signal and plot its two-sided spectrum. Support your answer with a block diagram. [15 marks] (b) Use the modulated signal generated in (a) above, which is the signal at the demodulator input to recover the modulating signal cos wmt. State what the type of demodulation scheme is. [10 marks]

Fig: 1