[matlab] matlab simulation modulation system - DSB system

Catalog

1、DSB System

2、 Run the image

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1、DSB System

close all;
clear all;
clc;
fm = 1; % Maximum frequency of source 
fc = 10; % Carrier center frequency 
dt = 0.001; % Time sampling interval 
T = 5; % Signal duration 
t = 0:dt:T;
mt = cos(2*pi*fm*t); % baseband signal 
%DSB  Modulated signal 
s_dsb = mt.*cos(2*pi*fc*t);
% % Generate narrow-band Gaussian white noise 
% B = 2*fm;
% N0 = 0.01; % White noise unilateral power spectral density 
% noise = noise_nb(fc,B,N0,t);
% s_dsb = s_dsb+noise;
figure(1);
subplot(2,1,1); plot(t,mt,'b-');
xlabel('t (s)'); title(' baseband signal ');
grid on;
subplot(2,1,2); plot(t,s_dsb,'b-');
hold on; plot(t,mt,'r:');
xlabel('t