Matlab ASK PSK FSK Code for Square and Sine Waves | Step-by-Step Guide

[sara_UK]

Hello guys..

I am trying to write a code for ASK in Matlab, but it doesn't give me the final figure!

% Generating a input square wave
x1 = 0:(pi/100):(10*pi);
y1 = square(x1);
A = plot(x1,y1);
figure(1),A,title( 'Square wave');xlabel('x'); ylabel('y');ylim([0,1]);grid;

% Generating a carrier(cosine wave) with a higher frequency as compared to sq.wave
f=0.8
t = 0:(pi/100):(10*pi);
y2 = cos(2*pi*f*t);
figure(2),B = plot(t,y2),title( 'Sine wave');xlabel('x'); ylabel('y');ylim([-2,2]); xlim([0,35]);grid;

ASK = A.^B;
figure(3),plot(t,ASK),title('ASK');xlabel('x'); ylabel('y');ylim([-2,2]); xlim([0,35]);grid;

your helpd would be very much appriciated .

Thanks

 

[n.karthick]

Your calculation of ASK is not correct and so you are not getting the plot. Please check.

 

[sara_UK]

Which calculation do u mean? and how do u suggest me correcting it?

 

[ram_krish]

you can fallow this blog to get code
kemppro.blogspot.in

 

[alphy]

for sharing your code with us. It seems like you are on the right track, but there are a few things that need to be addressed in order to get the desired output.

Firstly, in your ASK code, you are using the operator "^" which is used for exponentiation, but for ASK modulation, the carrier wave needs to be multiplied with the binary input signal. So instead of "A.^B", you should use "A.*B" to get the correct result.

Secondly, the frequency of the carrier wave should be much higher than the frequency of the input signal. In your code, you have set the frequency of the carrier wave to be 0.8, which is quite low. I would suggest using a frequency of at least 10 times higher than the input signal frequency.

Lastly, in order to see the final figure, you need to add the command "hold on" before the plot command in figure 3. This will ensure that all the plots are shown on the same figure.

I hope this helps and you are able to get the desired output. If you continue to face any issues, please feel free to reach out for further assistance. Keep up the good work!