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

The correct answer is B. OFDM was first introduced in 802.11a and is used by the ERP, HT and VHT PHYs as well. 173 --> "This PHY was made available through the 802.11a amendment in 1999." 175 --> "ERP is the first OFDM-based PHY that operates in 2.4 GHz, and OFDM is the first OFDM-based PHY that operates in 5 GHz. HT and VHT, explained later in this section, are both OFDM-based as well."

802.11 MAC and Physical Layers

Question

Options

AOFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.
BOFDM was first introduced in 802.11a and is used by the ERP, HT and VHT PHYs as well
COFDM implements BPSK modulation to allow for data rates up to 7 Gbps.
DOFDM modulation is used only in 5 GHz 802.11 transmissions.

How the community answered

(18 responses)

A
17% (3)
B
72% (13)
C
6% (1)
D
6% (1)

Explanation

173 --> "This PHY was made available through the 802.11a amendment in 1999." 175 --> "ERP is the first OFDM-based PHY that operates in 2.4 GHz, and OFDM is the first OFDM-based PHY that operates in 5 GHz. HT and VHT, explained later in this section, are both OFDM-based as well."

Topics

#OFDM#802.11a#ERP PHY#HT PHY

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