OFDM can generate a new symbol (composed of 48 subcarriers) every 4 microseconds . Based on that, it’s possible to signal 250,000 symbol transitions every second on each of the subcarriers.
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802.11ax introduces a longer OFDM symbol time of 12.8 μs , which is four times longer than the legacy symbol time of 3.2 μs. Subcarrier spacing is equal to the reciprocal of the symbol time. As a result of the longer symbol time, the subcarrier size and spacing decreases from 312.5 KHz to 78.125 KHz.
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