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Table 2 IEEE 802.11a PHY modes.

From: Efficient MAC Protocol for Subcarrier-Wise Rate Adaptation over WLAN

Mode Modulation Code rate Data rate Minimum sensitivity (dBm)
1 BPSK 1/2 6 Mbps
2 BPSK 3/4 9 Mbps
3 QPSK 1/2 12 Mbps
4 QPSK 3/4 18 Mbps
5 16-QAM 1/2 24 Mbps
6 16-QAM 3/4 36 Mbps
7 64-QAM 2/3 48 Mbps
8 64-QAM 3/4 54 Mbps