Fundamental OFDM question (MATLAB related)

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SUMMARY

The discussion centers on the implementation of an OFDM transceiver system in MATLAB, specifically addressing the necessity of upsampling binary data before feeding it into the IFFT block. The Nyquist criterion dictates that the sampling frequency should be at least twice the highest subcarrier frequency to avoid aliasing. Despite not upsampling the binary stream, the original message was correctly received, raising questions about the implications of this approach on signal integrity and performance.

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  • Understanding of OFDM (Orthogonal Frequency Division Multiplexing)
  • Familiarity with MATLAB and its IFFT function
  • Knowledge of the Nyquist criterion and sampling theory
  • Basic concepts of digital signal processing (DSP)
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  • Research the implications of not upsampling in OFDM systems
  • Learn about MATLAB's IFFT block and its configuration options
  • Study the Nyquist criterion in depth and its application in signal processing
  • Explore techniques for optimizing OFDM transceiver performance
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Engineers and developers working on digital communication systems, particularly those involved in OFDM implementation and MATLAB programming.

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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