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need help in generating plot of SNR vs standard deviation

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Shruti01

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Hello,

My code for AM modulation is as follows:

Code: 
t=0:0.001:1;
A=5;%Amplitude of signal
fm=input('Message frequency='); 
fc=input('Carrier frequency=');
mi=input('Modulation Index='); 
Sm=A*sin(2*pi*fm*t); % Message Signal
Sc=A*sin(2*pi*fc*t); % Carrier Signal
Sam=(A+mi*Sm).*sin(2*pi*fc*t); % AM Signal
y=awgn(Sam,10,'measured'); % Add white gaussian noise to AM signal

After this step, I want to plot a graph of SNR vs standard deviation. How to calculate SNR and standard deviation and plot them. Plz help.

Regards,
Shruti
 
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