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A=1.5;
Fr=20;
Fc=1000;
fs=10000;            %×ܹ²Ê±¼ä
t=[0:1/fs:0.1];         %Ò»¸öÂö³åʱ¼ä
mt=A*cos(2*pi*Fr*t);
S0_AM=(5+mt).*cos(2*pi*Fc*t);
S_AM=awgn(S0_AM,30);   %µ÷ÖÆÐźżÓÔë
wam=fft(S_AM);          %¸µÀïÒ¶±ä»¯
wam=abs(wam(1:length(wam)/2+1));           %Òѵ÷ÐÅºÅÆµÆ×
frqam=[0:length(wam)-1]*fs/length(wam)/2;%Òѵ÷ÐÅºÅÆµÆ×W
dam=ademod( S_AM,Fc,fs,'amssb');           %½âµ÷
dw_am=fft(dam);                          %¸µÀïÒ¶±ä»»
dw_am=abs(dw_am(1:length(dw_am)/2));      %½âµ÷ÐÅºÅÆµÆ×         
frqam1=[-2:length(dw_am)-3]*fs/length(dw_am)/2;
subplot(2,2,1);
plot(t,S_AM);           %»æÖÆAMÒѵ÷ÐźÅ
hold on;                %ÔÚͬһ½çÃæ¼ÌÐø»æÍ¼
plot(t,mt);            %»æÖÆAMµ÷ÖÆÐźÅ
grid on;                %»æÖÆAMÍø¸ñ
xlabel('t');
title(' µ÷ÖÆÐźÅ');
subplot(2,2,2);
plot(frqam,wam);        %»æÖÆAMÒѵ÷ÐÅºÅÆµÆ×
xlabel('w');
title('µ÷ÖÆÐÅºÅÆµÆ×');
grid on;
subplot(2,2,3);
plot(t,dam);          %»æÖÆAM½âµ÷ÐźÅ
xlabel('t');
title(' ½âµ÷ÐźÅ');
grid on;
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