this is a basic question, but i barely find any tutorial to explain this. Most of tutorial dont talk about why use IFFT and FFT, they just say "oh, at transmitter, we just take this information time domain as frequency domain, then we need IFFT". I have no idea why we want to treat as frequency domain when it was time domain. There must be some good reasons, right?
So, why we need the FFT pair for Tx & Rx for OFDM? Why not something else ? Someone could help me with some pictures? Thank you again, friend.
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