MATLAB code to plot the capacity of band limited AWGN channel with input constraint S and bandwidth B given by C=B log (1+S/N)

code:

    clc;

    s=input('enter signal power');

    w=input('enter the value of white power per unit bandwidth');

    b=0:0.1:100;

    d=w.*b;

    e=s./d;

    c=b.*log2(1+e);

    plot(b,c);

    xlabel('Bandwidth --->');

    ylabel('Capicaty--->');

    grid;

OUTPUT:

Enter signal power  45

Enter value of white power per unit bandwidth  5.