pre_transmitdiversity.asv

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function y=pre_transmitDiversity(x,P)
for i=1:M_layer;M_ap=2*M_layer;
   if 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] * [real(x1(i)),real(x2(i)),imag(x1(i)),imag(x2(i))].';
   else 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] * [real(x1(i)),real(x2(i)),re(x3(i)),Re(x4(i)),Im(x1(i)),Im(x2(i)),Im(x3(i)),Im(x4(i))].';
   end
end
y;