function [ofdm_dSource_pilot,pilotNUM] = addpilot_em(ofdm_Source,Dist)%ofdm_dSource表示發送信號，dist表示,我把ofdm_dSource改為ofdm_Source
   sizeP = size(ofdm_Source);
   pilotNUM = floor(sizeP(2)/Dist);
   for i = 1:pilotNUM
      ofdm_dSource_pilot(:,Dist*(i-1)+i) = ones(sizeP(1),1);%這里就少了一列數據了
      ofdm_dSource_pilot(:,Dist*(i-1)+i+1 : Dist*(i-1)+i+1 + Dist-1) = ofdm_Source(:,Dist*(i-1)+1:Dist*(i-1)+1 + Dist -1);
   end
   ofdm_dSource_pilot(:,Dist*(i-1)+i+1+Dist-1:sizeP(2)+pilotNUM)=ofdm_Source(:,Dist*i:sizeP(2));%這一句是我加的，用來保證最后一個導頻后面的也可以保留