[matlab] matlab simulation - simulate the AM modulation process of the modulation system

Catalog

1、AM Modulation process

2、AM Modulation process operation results

---

1、AM Modulation process

clear all;
clc;
% Generate baseband signal 
lower = 0;
upper = 3;
step = (upper-lower)/1e3; % Time sampling interval 
t = lower:step:upper;
fm = 1; % The highest frequency of baseband signal 
mt = cos(2*pi*fm*t);
% Conduct  AM  modulation - situation  1
A = 1.5;
fc = 10; % Carrier center frequency 
s_AM = (A+mt).*cos(2*pi*fc*t);
figure;
subplot(3,2,1); plot(t,mt,'b-');
hold on; plot(t,A*ones(size(t)),'r-');
xlabel('t (s)'); title