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Question 31 - CWNA-109 discussion

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

A.
OFDM implements BPSK modulation to allow for data rates up to 7 Gbps.
Answers
A.
OFDM implements BPSK modulation to allow for data rates up to 7 Gbps.
B.
OFDM was first introduced in 802.11a and is used by the ERP, HT and VHT PHYs as well.
Answers
B.
OFDM was first introduced in 802.11a and is used by the ERP, HT and VHT PHYs as well.
C.
OFDM modulation is used only in 5 GHz 802.11 transmissions.
Answers
C.
OFDM modulation is used only in 5 GHz 802.11 transmissions.
D.
OFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.
Answers
D.
OFDM was used by Frequency Hopping Spread Spectrum (FHSS) PHY devices.
Suggested answer: B

Explanation:

OFDM is a modulation method that divides the channel bandwidth into multiple subcarriers, each carrying a single data symbol. This allows for higher data rates and more robust transmissions in multipath environments. OFDM was first introduced in the 802.11a standard, which operates in the 5 GHz band and supports data rates up to 54 Mbps. Later, the 802.11g standard adopted OFDM for the 2.4 GHz band, and the 802.11n and 802.11ac standards enhanced OFDM with features such as MIMO (Multiple Input Multiple Output), channel bonding, and higher-order modulation schemes to achieve data rates up to 600 Mbps and 6.9 Gbps, respectively. These standards are collectively known as the ERP (Extended Rate PHY), HT (High Throughput), and VHT (Very High Throughput) PHYs .Reference:[CWNA-109 Study Guide], Chapter 4: Radio Frequency Signal and Antenna Concepts, page 163; [CWNA-109 Study Guide], Chapter 4: Radio Frequency Signal and Antenna Concepts, page 157.

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asked 16/09/2024
Pang Guo Ming
33 questions
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