1) SSB Demodulation: Consider the message waveform
and the SSB modulated signal mSSB-AM (T).You can use here whatever SSB method you like to use, such as phase method or Hilbert transform method. First obtain mSSB-AM (T) and demodulate it to get mDEMOD (T).
Now compare mDEMOD(T) and m(t) and illustrate the effect of local oscillator phase errors,Ø, and mDEMOD(T).
show the distortions for Ø=Π/20 ,Ø=Π/6 and Ø=Π/2 ,by plotting the frequency spectra and waveforms of mDEMOD
(T)and m(t) on separate graphs.
2) Envelope detection: Demodulate the signal s(t)=Ac ⌈1+km(t)⌉cos(2Πƒct) , where fc =250 Hz, and k = 0.85. Plot the modulated signal, the message and its demodulated version. Try filters with bandwidth of 300 Hz and 100 Hz.
3) Frequency modulation: Let m(t) modulate a carrier cos(2Πƒc T) where fc =200 Hz and frequency deviation kf =50 in the expression s(t)=Ac cos(2Πfct+2Π kf ∫m(s)ds. plot the waveforms and spectra of the message signal and the modulated signal
4) Frequency modulation: Let
The message m(t) modulates a carrier cos (2Πfct) where fc=250 Hz freqeuncy deviation kf=100 plot the modulated signal in the time and frequency domain. Also plot the waveforms of the modulating signal and its demodulated version and compare