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Exam CWAP-404 Topic 5 Question 10 Discussion

Actual exam question for CWNP's CWAP-404 exam
Question #: 10
Topic #: 5
Finish the statement. It is possible to distinguish between _______and ______20 MHz transmissions when looking at an FFT plot.

Suggested Answer: D Vote an answer

It is possible to distinguish between OFDM 20 MHz transmissions and HT 20 MHz transmissions when looking at an FFT plot. OFDM and HT are two different modulation schemes used by
802.11 WLANs. OFDM is used by legacy 802.11a/g devices, while HT is used by newer
802.11n/ac devices. OFDM and HT have different spectral characteristics that can be observed on an FFT plot. OFDM transmissions have a flat spectrum with sharp edges, while HT transmissions have a tapered spectrum with rounded edges. This is because HT uses guard intervals and cyclic prefixes to reduce inter-symbol interference and improve performance. The other options are not correct, as they do not describe different modulation schemes or channel widths that can be distinguished on an FFT plot.

by Fanny at Oct 19, 2024, 06:53 PM

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