Fundamental OFDM question (MATLAB related)

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The discussion centers on the necessity of upsampling binary data before feeding it into the IFFT block in an OFDM transceiver system. The original poster questions why their system functions correctly without upsampling, despite the Nyquist criterion suggesting it should be done to avoid aliasing. They express confusion over receiving the original message accurately when only one sample is used per symbol interval. Participants highlight the importance of ensuring sufficient sampling points to represent the signal accurately. The conversation emphasizes the balance between theoretical principles and practical outcomes in OFDM implementation.
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)?
 
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