gen_data.m

OFDM Source is very easy. so you can easily understand.

function [s]=gen_data(M,D);

if  M==2;
   a=2;b=1;c=0;d=0;%BPSK
elseif M==4;
    a=2;b=1;c=1;d=1;%QPSK
elseif M==16;
    a=4;b=3;c=3;d=1;%16QAM
end; 
  
rand_I=rand(1,D);
rand_Q=rand(1,D);

[s]=2*fix(a*rand_I)-b+i*(2*fix(a*rand_Q)-b)*d;