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CWNA - Flash Cards - Chapter 6
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- 1Radio that transmit dynamic frequency selection (DFS) are in this UNI bandU-NII-2
- 2255 MHz wide and spans from 5.470 GHz to 5.725 GHzU-NII-2 Extended
- 3Delay spread is too great, data from the reflected signal may interfere with the same data stream from the main signalIntersymbol interference (ISI)
- 4Series 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 spaceDSSS data encoding
- 5As 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 bitBarker Code
- 6Transmits across 52 separate, closely and precisely spaced frequencies, often referred to as subcarriersOFDM
- 7In OFDM, a forward error correction (FEC) that allows the receiving system to detect and repair corrupted bitsConvolutional coding
- 8OFDM uses _______________ and _____________ phase modulation for the lower ODFM data rates- binary phase shift keying (BPSK)
- quadrature phase shift keying (QPSK) - 92.4 GHz ISM band, distance between channel centre frequencies5MHz
- 10DSSS and HR-DSSS channel width22MHz
- 112.4GHz, distance between non-overlapping channel center frequencies25MHz
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- Fichas sobre CWNA - Flash Cards - Chapter 6, creado por Amit Pindoria el 23/02/2017.
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- Amit Pindoria
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