pre_transmitdiversity.asv

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function y=pre_transmitDiversity(x)
for i=1:M_layer;M_ap=2M_layer;
   if sum(p)=2;
     y(i)=[y1(i),y2(i)].';
     [y1(2i),y2(2i),y1(2i+1),y2(2i+1)].'=1/sqrt(2)*[1,0,j,0;0,-1,0,j;0,1,0,j;1,0,-j,0]*[Re(x1(i)),Re(x2(i)),Im(x1(i)),Im(x2(i))];
   else sum(p)=4;
     y(i)= [y1(i),y2(i),y3(i),y4(i)].';  
     [y1(4i),y2(4i),y3(4i),y4(4i),y1(4i+1),y2(4i+1),y3(4i+1),y4(4i+1),y1(4i+2),y2(4i+2),y3(4i+2),y4(4i+2),y1(4i+3),y2(4i+3),y3(4i+3),y4(4i+3)].'=1/sqrt(2)*[1,0,0,0,j,0,0,0;0,0,0,0,0,0,0,0;0,-1,0,0,0,j,0,0;0,0,0,0,0,0,0,0;0,1,0,0,0,j,0,0;0,0,0,0,0,0,0,0;1,0,0,0,-j,0,0,0;0,0,0,0,0,0,0,0;0,0,0,0,0,0,0,0;0,0,1,0,0,0,j,0;0,0,0,0,0,0,0,0;0,0,0,-1,0,0,0,j;0,0,0,0,0,0,0,0;0,0,0,1,0,0,0,j;0,0,0,0,0,0,0,0;0,0,1,0,0,0,-j,0]*[Re(x1(i)),Re(x2(i)),Re(x3(i)),Re(x4(i)),Im(x1(i)),Im(x2(i)),Im(x3(i)),Im(x4(i))];