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Table 1 Data rate adjustment on each subcarrier according to symbols assigned in bit-map-adjustment ofdm symbols.

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

Symbol on a subcarrier in previous Bit-Map-Adjustment OFDM symbol Symbol on a subcarrier in current Bit-Map Adjustment OFDM symbol Data rate adjustment in Bit Map
−1 −1 Decrease one level from the previous data rate
−1 1 Do not change
1 −1 Do not change
1 1 Increase one level from the previous data rate