Why are OFDM Subcarriers Sinc Functions?

Explains the relationship between the time domain OFDM transmitted signal, and the orthogonal subcarriers in the frequency domain.

Note that I simplified the diagram, only showing the elements of the vector that relate to the data-carrying sub channels. For the actual frequency domain vector that goes into the IFFT, the first element will correspond to the zero-frequency (ie. constant) waveform, so you can't put data (or a complex constellation point) into that element.

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