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802.11a/g (OFDM) modulation and EVM requirements

ModulationData rateMinimum EVM requirement (RMS)Equivalent dB
BPSK6 Mbps≤ 20%≥ -13 dB
QPSK12 Mbps≤ 17.5%≥ -15.1 dB
16-QAM24 Mbps≤ 12.5% ​​≥ -18.1 dB
64-QAM54 Mbps≤ 8%≥ -21.0 dB

Note: 802.11a and 802.11g use the same OFDM technology at the physical layer, so the modulation and EVM requirements are consistent.

802.11b (DSSS/CCK) modulation mode and EVM requirements

Modulation modeData rateMinimum EVM requirement (RMS)Equivalent dB
DBPSK1 Mbps≤ 35%≥ -9.11 dB
DQPSK2 Mbps≤ 35%≥ -9.11 dB
CCK (DQPSK)5.5 Mbps≤ 35%≥ -9.11 dB
CCK (DQPSK)11 Mbps≤ 35%≥ -9.11 dB

Note: Due to the strong anti-interference ability of DSSS and CCK, the EVM requirements of 802.11b are relatively loose

MCS0–MCS15 corresponding modulation mode and EVM Requirements (802.11n/ac/ax/be)

MCS IndexModulationMinimum EVM requirement (dB)
MCS0BPSK≥ -5
MCS1QPSK≥ -10
MCS2QPSK≥ -10
MCS316-QAM≥ -16
MCS416-QAM≥ -16
MCS564-QAM≥ -22
MCS664-QAM≥ -22
MCS764-QAM≥ -28
MCS8256-QAM≥ -31
MCS9256-QAM≥ -35
MCS101024-QAM≥ -37
MCS111024-QAM≥ -38
MCS124096-QAM≥ -40
MCS134096-QAM≥ -41
MCS144096-QAM≥ -41