Suppressed Carrier Amplitude Modulation

Fig 1  System Level Block Diagram of Suppressed Carrier AM

Fig 2
Simulink Block Diagram of Suppressed Carrier AM
Generated Sine wave = 1sin(1000*2*pi*t)  This is the Carrier Frequency. 
x(t) = 1sin(200*2*pi*t)  This is the signal entered into the system.

 

Scope Plots

   
Fig 3 Experimental AM plot, Time domain

 

Fig 4  FFT of Fig 3
Note the carrier frequency is 1000Hz and the signal, x(t) is 1000Hz +/- 200Hz

 

MATLAB Simulations

    

Fig 5 Simulations of AM in MATLAB.  Shown in Time and Frequency Domain.
These simulations are comparable to what was found in lab. 

 

Demodulation
For demodulation, a phase locked loop and low pass filter are required.