H12-323_V2.0 · Question #539
In WLAN networks, Wi-Fi 6 has significant performance improvements compared to Wi-Fi 5. Among them, the single-user large bandwidth performance supported by Wi-Fi 6 is mainly improved by…
The correct answer is A. True. Option A is correct because Wi-Fi 6 (802.11ax) genuinely improves single-user peak throughput through two key mechanisms: it increases the number of effective subcarriers by shrinking subcarrier spacing from 312.5 kHz to 78.125 kHz (yielding 4× more subcarriers per channel)…
Question
In WLAN networks, Wi-Fi 6 has significant performance improvements compared to Wi-Fi 5. Among them, the single-user large bandwidth performance supported by Wi-Fi 6 is mainly improved by technologies such as the number of effective subcarriers and 1024-QAN encoding method.
Options
- ATrue
- BFalse
How the community answered
(32 responses)- A72% (23)
- B28% (9)
Explanation
Option A is correct because Wi-Fi 6 (802.11ax) genuinely improves single-user peak throughput through two key mechanisms: it increases the number of effective subcarriers by shrinking subcarrier spacing from 312.5 kHz to 78.125 kHz (yielding 4× more subcarriers per channel), and it adopts 1024-QAM modulation instead of Wi-Fi 5's 256-QAM, encoding 10 bits per symbol rather than 8 - a ~25% boost in spectral efficiency per symbol. Note that "1024-QAN" in the question is a typo for 1024-QAM (Quadrature Amplitude Modulation); recognizing this prevents confusion on the exam. Option B (False) is incorrect because both claims in the statement are factually accurate and well-documented in the 802.11ax standard. A useful memory tip: think "more subcarriers + denser constellation = wider, faster lane" - Wi-Fi 6 narrows each lane (subcarrier) to fit more lanes, then packs more bits into each lane (1024-QAM), together maximizing single-user bandwidth.
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