[matlab] matlab simulation of modulation system - power spectrum and coherent demodulation of AM modulated signal

Catalog

1、AM Power spectrum and coherent demodulation of modulated signal

2、 Running results

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1、AM Power spectrum and coherent demodulation of modulated signal

clear all;
clc;
% Generate baseband signal 
dt = 0.001; % Time sampling interval 
T= 5; % Signal duration 
t = 0:dt:T;
fm = 1; % The highest frequency of baseband signal 
mt = cos(2*pi*fm*t); % baseband signal 
%AM  modulation 
A = 1.2;
fc = 10; % Carrier center frequency 
s_am = (A+mt).*cos(2*pi*f