# SSB Demodulation and Envelope detection

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## Product Description

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)=A⌈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(2ΠƒT) where fc =200  Hz  and   frequency  deviation k=50  in  the  expression s(t)=Acos(2Πfct+2Π k∫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