You can see that 802.11a/g has 64 subcarriers by dividing the channel bandwidth (20 MHz) by the subcarrier bandwidth (312.5 kHz).
A 312.5 KHz subcarrier is used in OFDM. Figure 1: OFDM subcarriers for the 802.11n/ac 20 MHz channel. The longer OFDM symbol time introduced by 802.11ax is 12.8 s, which is four times longer than the legacy symbol time of 3.2 s.
You can observe that 802.11a/g has 64 subcarriers if you divide the channel bandwidth (20 MHz) by the subcarrier bandwidth (312.5 kHz).
The sum of one or more 802.11a OFDM symbols, each consisting of 52 orthogonal subcarriers, results in an OFDM carrier signal (burst type), with the baseband data on each subcarrier being individually modulated using quadrature amplitude modulation (available formats: BPSK, QPSK, 16-QAM, or 64-QAM).
Each OFDM symbol in 802.11 lasts 4 seconds. This indicates that each OFDM symbol has 80 samples at a 20 MSPS sampling rate.
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