demap.m

两发两收的空间多路复用信道的matlab仿真程序。

function symdata=demap(data, qam)
% make decision of each data subcarrier in one OFDM symbol

symdata=zeros(1,length(data));
Metric=zeros(1,qam);

IQvalue=get80216map(qam);

for n=1:length(data)
    Metric=abs(IQvalue-data(n));
    index=find(Metric==min(Metric));      % find index of the minimus distance element
    if length(index)>1
        index=index(1);
        disp('Uncertain');
    end
    symdata(n)=index-1;
end