7822903
Descrição
FlashCards por Amit Pindoria, atualizado more than 1 year ago
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Criado por Amit Pindoria
quase 8 anos atrás
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| Questão | Responda |
| 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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