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This is very good question! OFDM is a very efficient broadband technology. It increases data capacity and the number of users in multiple access scheme, comparing to other broadband technologies using the same bandwidth. MIMO also increases the capacity, and multiple access ability. These two combined together form a Modulation scheme which is very efficient in terms of bandwidth efficiency and throughput.
But I sense there must be other reasons as well that I am not aware of. I would let you know if I find anything else.
MIMO it self is a good technique to achieve diversity gain at receiver, which basically increase the reliability of system as well SNR margin.
Addition to the above comments, OFDM also has a good flexibility over the multipath fading channels. It uses frequency very efficiently (think about FDM) and require no hardware wise filtering but only FFT/IFFT enable transmit and receive relevant signals easily.
MIMO and OFDM is a good combination to increase all the performance....!!!
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