matlab BPSK 调制与解调
1、调制
clear all;
g=[1 0 1 0 1 0 0 1];%基带信号
f=100; %载波频率
t=0:2*pi/99:2*pi;
cp=[];sp=[];
mod=[];mod1=[];bit=[];
for n=1:length(g);
if g(n)==0;
die=-ones(1,100); %Modulante
se=zeros(1,100); %
else g(n)==1;
die=ones(1,100); %Modulante
se=ones(1,100); %
end
c=sin(f*t);
cp=[cp die];
mod=[mod c];
bit=[bit se];
end
bpsk=cp.*mod;
subplot(2,1,1);plot(bit,'LineWidth',1.5);grid on;
title('Binary Signal');
axis([0 100*length(g) -2.5 2.5]);
subplot(2,1,2);plot(bpsk,'LineWidth',1.5);grid on;
title('ASK modulation');
axis([0 100*length(g) -2.5 2.5]);
2、调制解调加噪声
clc;
close all;
clear;
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