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What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM) in IEEE 802.11

What statement is true concerning the use of Orthogonal Frequency Division Multiplexing (OFDM)
in IEEE 802.11 WLANs?

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A.
802.11a and 11n use six (6) “pilot” subcarriers as a reference for the receiver to detect
frequency and phase shifts of the signal.

B.
802.11a/g/n OFDM includes several combinations of modulation and coding to achieve data
rates from 1-600 Mbps.

C.
With 802.11a OFDM, 16-QAM provides either 48 or 54 Mbps data rates, depending upon
coding rates.

D.
802.11n HT-OFDM utilizes 256-QAM, which increases the data rate from 54 Mbps (with 64-QAM) up to 65 Mbps.

E.
In 802.11a OFDM, forty-eight (48) subcarriers are used as parallel symbol transmission paths
to carry data.

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