%close all
clear all
clc
A=1;
m=1;
f_c=200;
num_points =500;
t=(0:5*num_points-1)*2e-5;
delta_t = 2e-5;
x_BB = [ones(1,num_points) -2*ones(1,num_points) ones(1,2*num_points) 2*ones(1,num_points)];
sum=0;
for i=1:length(t)
sum = sum + x_BB(i) * delta_t;
int_x_BB (i) = sum;
end
%figure
%plot(int_x_BB)
m_FM =1000;
x_FM = A * cos (2 *pi *f_c *t + m_FM * int_x_BB);
m_PM=10;
x_PM = A * cos (2 *pi *f_c *t + m_PM * x_BB);
figure
subplot(311),plot(t, x_BB,'-r');
%xlabel('{\itt}'),
ylabel('{\itx}_{BB}');
axis([0 0.05 -2.2 2.2])
subplot(312),plot(t, x_FM,'-g');
%xlabel('{\itt}'),
ylabel('{\itx}_{FM}');
axis([0 0.05 -1.1 1.1])
subplot(313),plot(t, x_PM,'-b');
%h=plot(t, x_BB,'-r', t, x_AM,'-g', t, x_DSB_AM,'--b');
%set(h,{'LineWidth'},{1;2;2});
xlabel('{\itt}'), ylabel('{\itx}_{PM}');
%legend('BB signal', 'AM signal', 'DSB-AM signal')
axis([0 0.05 -1.1 1.1])
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Example7_2.rar_run
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wireless communication (modulation and demodulation)which can be run matlab platform
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