%ECOMMS Spring 99
%S. Mandayam, Rowan University
%Angle Modulation

clear; close all;

%definitions
t=[0:1e-4:5e-2];
fm=100;
fc=1e3;
Am=0.8;
Dp=5;
Df=5;

%carrier
c=cos(2*pi*fc*t);
subplot 511;
plot(t,c);
ylabel('Carrier');

%message
m=sin(2*pi*fm*t);
subplot 512;
plot(t,m);
ylabel('Message');

%AM wave
am=c.*(1+Am*m);
subplot 513;
plot(t,am);
ylabel('AM');

%PM wave
pm=cos(2*pi*fc*t + Dp*m);
subplot 514;
plot(t,pm);
ylabel('PM');

%FM wave
fm=cos(2*pi*fc*t - Df*cos(2*pi*fm*t));
subplot 515;
plot(t,fm);
ylabel('FM');