despread.m

此程序为DS-CDMA链路中加入基于子空间的PASTd多用户检测方法。系统中采用m序列阔频

% Program 5-8
% despread.m
%
% Data despread function.
% Programmed by yixiongshu.2006.8.9
function [iout,qout]=despread(idata,qdata,code1)
%
% idata : ich data sequence.
% qdata : qch data sequence.
% iout : ich output data sequence
% qout : qch output data sequence
% code1 : spread code sequence

%
switch nargin
    case{0,1}
        error('lack of input argument');
    case 2
        code1=qdata;
        qdata=idata;
end
[hn,vn]=size(idata);
[hc,vc]=size(code1);

vn=fix(vn/vc);
iout=zeros(hc,vn);
qout=zeros(hc,vn);

for ii=1:hc
    iout(ii,:)=rot90(flipud(rot90(reshape(idata...
        (ii,:),vc,vn)))*rot90(code1(ii,:),3));
    qout(ii,:)=rot90(flipud(rot90(reshape(qdata...
        (ii,:),vc,vn)))*rot90(code1(ii,:),3));
end

% end of file.