de_layermappingforspatialmultiplexingtwocodewords.m

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function [d0,d1]=de_layerMappingForSpatialMultiplexingTwoCodeWords(numberOfLayers,x)
% x=[1 2 3 4 5 6 7 8];
% numberOfLayers=4;
if numberOfLayers==2 select=0;
   elseif numberOfLayers==3 select=1;
   elseif numberOfLayers==4 select=2;
   end
M_layer_symb=length(x);
switch select;
    case 0,d0=zeros(1,length(x)/2);
           d1=zeros(1,length(x)/2); 
           d0=x(1:M_layer_symb/2).',
           d1=x(M_layer_symb/2+1:end).',
    case 1,d0=zeros(1,length(x)/3);
           d1=zeros(1,2*length(x)/3);
           d0=x(1:M_layer_symb/3);
           d1(1:2:end)=x(M_layer_symb/3+1:2*M_layer_symb/3);
           d1(2:2:end)=x(2*M_layer_symb/3+1:end);
           d0=d0.',d1=d1.',
    case 2,d0=zeros(1,2*length(x(1,1:end)));
           d1=zeros(1,2*length(x(3,1:end)));
           d0(1:2:end)=x(1,1:end);
           d0(2:2:end)=x(2,1:end);
           d0=d0;
           d1(1:2:end)=x(3,1:end);
           d1(2:2:end)=x(4,1:end);
           d1=d1;
end
end
end