The DFT (Discrete Fourier Transform) is a form of Fourier analysis. It transforms one function into another, which is called the frequency domain representation, or simply the DFT, of the original function(which is often a function in the time domain). In most telecom systems, this means that the number symbols to be transmitted are mapped to the same number of subcarriers, e.g. 12 symbols to 12 subcarriers.
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