In the OFDM block diagram at the transmitter side, the next operation is an *IDFT*.

## IFFT

As we have learned earlier, an IDFT (or DFT) is implemented in an efficient manner through an IFFT (or FFT) algorithm. Therefore, a block of $N$ data symbols is an input in an IFFT block that generates the corresponding time-domain signal.

The following code helps us understand this concept:

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