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

in IEEE 802.11 WLANs?

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.