What I understand in MIMO system, the user data is broken down into several chunks and transmitted over the antennas (say 3 Tx antennas) by using same frequency Fc. In order to use the interference as an advantage in this case.
And what I know of OFDM, the large BW is divided into several smaller ones, with each having a specific frequency. For example, 2.4GHz BW is divided into 14 channels, each channel has a different central frequency (say the 6th channel has a frequency of 2.437 MHz).
Now the question is while we combine this 2 method of MIMO-OFDM for transmission, does that transmit in same frequency from each antenna? Or at different frequencies?