de_spread.m

TD中扩频的链路级仿真 通过MATLAB实现

%解扩

function [DS_Signal]=De_Spread(Received_Signal,user_code);
a=Received_Signal;
n1=length(a);            %收到的比特数
n2=length(user_code);  
n3=n1/n2 ;                %扩频前用户发送的码元数

user_code1=zeros(1,n1);
for ii=1:n3,
    for jj=1:n2,
        user_code1((ii-1)*n2+jj)=user_code(jj);
    end 
end
DS_Signal1=a.*user_code1;
DS_Signal=zeros(1,n3);
for ii=1:n3,
    DS_Signal(ii)=DS_Signal1((ii-1)*n2+n2/2);
end                                            %取中间的码元