CWNA - Flash Cards - Chapter 6

Question	Answer
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

Resource summary

	Created by Amit Pindoria almost 8 years ago