In OFDM, I understand that the sub-carriers can be located closer to each other than in regular FDM by ensuring that the "peaks" of each sub-carrier aligns with the "zeroes" of their neighbouring subcarriers.
However, for the life of me I just cant find any good videos that can explain what OFDMA actually is. It seems like it has sthg to do with a user being able to be allocated "blocks" of sub-carriers of different bandwidths depending on how much they require?
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