What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM)
in IEEE 802.11 WLANs?
802.11a and 11n use six (6) “pilot” subcarriers as a reference for the receiver to detect
frequency and phase shifts of the signal.
802.11a/g/n OFDM includes several combinations of modulation and coding to achieve data
rates from 1-600 Mbps.
With 802.11a OFDM, 16-QAM provides either 48 or 54 Mbps data rates, depending upon
802.11n HT-OFDM utilizes 256-QAM, which increases the data rate from 54 Mbps (with 64-QAM) up to 65 Mbps.
In 802.11a OFDM, forty-eight (48) subcarriers are used as parallel symbol transmission paths
to carry data.