This question is really related to - is there any need for IFFT in the first place?
If we want to send a bunch of complex-numbers (vectors), then most OFDM discussions involve presenting those numbers to an IFFT block, and the output of the IFFT block will then have a bunch of complex numbers for which to transmit in a queued fashion through a QAM block.
Can I ask ----- is the IFFT block really necessary? Instead of using the IFFT block, is it possible to just place the original set of complex numbers (vectors) on the queue....and then transmit those numbers (real and imaginary components) - one at a time - through a QAM block?
The signal (without using IFFT) is still going to be OFDM, right?
Thanks for any comments/advice!