CWNA - Flash Cards - Chapter 6

Amit Pindoria
Flashcards by Amit Pindoria, updated more than 1 year ago
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Flashcards on CWNA - Flash Cards - Chapter 6, created by Amit Pindoria on 02/23/2017.
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Radio that transmit dynamic frequency selection (DFS) are in this UNI band U-NII-2
255 MHz wide and spans from 5.470 GHz to 5.725 GHz U-NII-2 Extended
Delay spread is too great, data from the reflected signal may interfere with the same data stream from the main signal Intersymbol interference (ISI)
Series of bits that are referred to as chips need only 2 MHz of frequency space, the 11 chips will require 22 MHz of frequency carrier space DSSS data encoding
As many as 9 of the 11 chips can be corrupted, yet the receiving radio will still be able to interpret the sequence and convert them back into a single data bit Barker Code
Transmits across 52 separate, closely and precisely spaced frequencies, often referred to as subcarriers OFDM
In OFDM, a forward error correction (FEC) that allows the receiving system to detect and repair corrupted bits Convolutional coding
OFDM uses _______________ and _____________ phase modulation for the lower ODFM data rates - binary phase shift keying (BPSK) - quadrature phase shift keying (QPSK)
2.4 GHz ISM band, distance between channel centre frequencies 5MHz
DSSS and HR-DSSS channel width 22MHz
2.4GHz, distance between non-overlapping channel center frequencies 25MHz
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