modulate.m

TD中扩频的链路级仿真 通过MATLAB实现

%把信号调制为QPSK
function [Modulate_Signal]=Modulate(Send_Signal);
s=Send_Signal;
n=length(s);  
b=zeros(1,2);
c=zeros(1,n/2);
for ii=1:2:(n-1),
    b(1)=s(ii);b(2)=s(ii+1);
 
    if b==[1,1],c((ii-1)/2+1)=i;    
    elseif b==[-1,1],c((ii-1)/2+1)=-1;  
    elseif b==[-1,-1],c((ii-1)/2+1)=-i; 
    elseif b==[1,-1], c((ii-1)/2+1)=1;  
    end;
    
end    
Modulate_Signal=c;