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Step 4 (Set the value of the Bit-Map-Adjustment symbol of the CTS).
Once the values of the Bit-Map-Adjustment symbol are decided, the actual data rate for the upcoming data transmission is selected according to Table 1.
According to the decision in Step 2, the receiver sets the Bit-Map-Adjustment symbol to 1 to increase or -1 to decrease the data rate on each subcarrier.
If the decision of a subcarrier is not to change the data rate, the receiver sets the Bit-Map-Adjustment symbol to a different value from the one used in the same subcarrier of the previous CTS.
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 Figure 5 Data rate transition diagram.
The CTS packet includes the Bit-Map-Adjustment OFDM symbol updated by the receiver.
When the Bit-Map-Flag subfield is set to 1111, a "Bit-Map-Adjustment" OFDM symbol is inserted between the PLCP header and MPDU.
Table 1 Summary of hard sphere model performance reproducing PREM Model variant Comments Adjustments Plausibility (symbol) Carnahan-Starling (HS) d V/d r discrepant Additional explicit thermal expansivity contributions No. M too small; requires large amounts of H or He in the core.
Since what is to be observed is the optimal value of pilot symbol power adjustment, an SNR of 10 dB has been chosen.
Contributions of this article are: ● We deliver an optimal pilot symbol power adjustment in MIMO OFDM systems under time-variant channels.
Table 1 Data rate adjustment on each subcarrier according to symbols assigned in bit-map-adjustment ofdm symbols.
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