Introduction of 1024QAM

One subcarrier now carries up to 10 bit information from 11ax. With 1024 QAM, 11ax has higher data rate as MCS10 (1024QAM, 3/4 coding rate) and MCS11 (1024QAM, 5/6 coding rate) and LDPC is mandatory in MCS10 and MCS11 for coding scheme.

1024QAM : New Modulation Scheme in HE, Wi-Fi, wifi, WLAN, IEEE802.11ax
1024QAM : New Modulation Scheme in HE
Comparison on MCS9 between 11ac and 11ax

Logically, with 4 more subcarriers in 4 longer symbol, 11ax OFDM makes the same data rate of 11ac OFDM. With the same modulation and coding rate, and with the longest GI (Long GI for 11ac and 3.2usec GI for 11ax), VHT80 and HE80 data rate are 390Mbps and 408.33Mbps each. The reason they have a small amount of difference is the number of subcarrier utilized. 234 data subcarrier in 11ac and 980 data subcarrier in 11ax used in case of 80MHz BW. (234 x 4 = 936 < 980)

VHT and HE Data Rate Comparison : MCS9, Wi-Fi, wifi, WLAN, IEEE802.11ax
VHT and HE Data Rate Comparison : MCS9
Comparison on highest data rate between 11ac and 11ax

Along with Normal GI, 2 bit more information on each subcarrier and 4 times more subcarrier in one symbol in 11ax masks a big difference (about 30%) between 11ac and 11ax at highest data rate.

VHT and HE Data Rate Comparison : highest MCS, Wi-Fi, wifi, WLAN, IEEE802.11ax
VHT and HE Data Rate Comparison : highest MCS
Data rate for HE20/40/80/160 of SU and full RU
HE Data Rate for SU and full RU, Wi-Fi, wifi, WLAN, IEEE802.11ax
HE Data Rate for SU and full RU
Data rate for 26, 52, 106 tone RU
HE Data Rate for 26,52,106 tone RU
HE Data Rate for 26,52,106 tone RU
HE data rate with MIMO, DCM and GI

Data rate with DCM is half of data rate without DCM. With normal GI (0.8 usec), data rate goes up by 15% compared with Quadrature GI (3.2 usec)

HE Data Rate with MIMO, DCM and GI
HE Data Rate with MIMO, DCM and GI

End of Topic

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