%====================================================
%  Cobayashi Laboratory , Mie University, Japan
%
%                   Last Modified by  tao,2001/05/17 
%====================================================
function out = f_DeMQAM(in,M)

if M == 1
    data = zeros(size(in,1),size(in,2));
else
    table = f_GetPoints(M);
    
    for ii = 1:size(in,1)
        for jj= 1:size(in,2)
            [minval minindex] = min(abs(in(ii,jj) - table));
            data(ii,jj) = minindex-1;
        end
    end
end

out = data;