Using IFFT for the purpose of "Multiple Orthogonal Frequency Shift Keying"
Yes, basically this is OFDM with an on/off constellation for each subcarrier instead of a QAM constellation as often used. So you would map your data to FFT values (each FFT bin is either 1 or 0), then take the IFFT to create the transmit waveform, with the cyclic prefix etc as in standard OFDM implementations.