O.J.
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Upon feeding the IFFT block with the mapped date elements, shouldn't the binary data be upsampled by a sampling frequency that is equal to twice the highest subcarrier frequency (nyquist criterion)? I have written a code for a complete OFDM trasceiver system and I have not upsampled my binary stream and sent it directly to the IFFT block. I do get the original message correctly at the receiver which is kind of weird since not upsampling is like modulating a carrier (cosine) with only one sample so it willonly give one value during the symbol interval. However we need to have enough points within the interval (at least twice the subcarriers frequency)?