Please tell me is this correct.. To add precoding block in between interleaver and modulator in OFDM? Serial to parallel transmission in OFDM?

This is the code. I have tried to do linear precoding...

%input
msg = round(rand(1,nBitPerSym*nSym));
% trellis 
trel = poly2trellis(3,[7 5]);
% % % convolution encoder
code = convenc(message,trel);
% state 
st2 = 4831;
inter1 = randintrlv(code,st2);

%precoding

N=nSym ;
x = zeros(2,N);
x1 = reshape(inter1,2,length(inter1)/2); 
x2 =[conj(double(x1(2,:))); conj(double(x1(1,:)))]; 
x=[x1;x2]

[rowSize, colSize] = size(x);
% Converting two rows into one concatenated row. 
p_Data = reshape(x,rowSize*colSize,1);
p_Data = sqrt(2) * p_Data;

y1=inter1./p_Data';

Then this y1 is QAM modulated and further OFDM is done...

Please tell me whether this is correct

Also  serial to parallel conversion in ofdm is 
for ii = 1:length(EbN0dB) 

      % Transmitter 
     %    MODULATE 

      h1 = modem.qammod(16);
      qm1 = modulate(h1, inter);

     %ipBit1 = inter1(1:length(msg)) ; 
  %    MODULATE 
     %ipMod1 = 2*ipBit1-1; 

     h2 = modem.qammod(16);
      qm = modulate(h2, inter1);
  % %    combine

     ipMod1=qm;

     ipMod = reshape(ipMod1,nBitPerSym,2*nSym).'; % group into multiple streams
  .
  .
  end

does this reshaping is the actual serial to parallel transmission block in OFDM?