Karteikarten
06
Karten in diesem Stapel (29)
- 12.4 GHz ISM Band100 MHz wide
2.4 - 2.5 GHz - 2UNII-1 Band5.15 - 5.25 GHz
100 MHz wide
Four 20 MHz channels - 3UNII-2 Band5.25 - 5.35 GHz
100 MHz wide
Four 20 MHz channels - 4UNII-2 Extended5.470 - 5.725 GHz
255 MHz wide
12 channels - 5UNII-3 Band5.725 - 5.850 GHz
125 MHz wide
Five 20 MHz channels - 6NarrowbandUses little bandwidth to transmit data
- 7Spread spectrumUses more bandwidth to carry data
Spreads data across frequencies - 8Delay spreadDelay between main signal and reflected signal
- 9Intersymbol interference (ISI)Delay spread too great
- 10Dwell timeSpecific amount of time FHSS system transmits on specific frequency before switching to next frequency
- 11Hop TimeAmount of time to change from one frequency to another
- 12Direct Sequence Spread Spectrum1 and 2 Mbps
- 13High-Rate DSSS5.5 and 11 Mbps
- 14Baker codeUse of a pseudorandom number
DSSS data encoding - 15Complementary Code Keying (CCK)DSSS data encoding
Provides faster speeds for HR-DSSS - 16Differential binary phase shift keying (DBPSK)Modulation of signal to carrier signal
Uses two phase shifts - 17Differential quadrature phase shift keying (DQPSK)Modulation
Four phase shifts
Faster throughput - 18PBCCPacket Binary Convolutional Code
Modulation technique
5.5, 11, 22, and 33 Mbps - 19OFDMOrthogonal Frequency Division Multiplexing
Used at 5 GHz and ERP-OFDM at 2.4 GHz - 20How many subcarriers in OFDM52 subcarriers per channel
Each subcarrier is a separate channel
Subcarrier width is 312.5 KHz - 21Error correction used in OFDMConvolutional Coding
- 22Modulation used in OFDMBinary Phase Shift Keying (BPSK)
Quadrature Phase Shift Keying (QPSK) for lower data rates - 23Higher OFDM data rates modulation method16-QAM
64-QAM - 24QAMQuadrature Amplitude Modulation
Hybrid of phase and amplitude modulation - 25How many channels in 2.4 GHz14
- 262.4 GHz Channels1 - 2.412
2 - 2.417
3 - 2.422
4 - 2.427
5 - 2.432
6 - 2.437
7 - 2.442
8 - 2.447
9 - 2.452
10 - 2.457
11 - 2.462
12 - 2.467
13 - 2.472
14 - 2.484 - 27DSSS / HR-DSSS channel width22 MHz
- 28Number of 20 MHz channels in 5 GHz for usage25
- 29Usable 40 MHz channels in 5 GHz12
Informationen
- Beschreibung
- cwna CWNA Karteikarten am 06, erstellt von rowelld am 07/09/2015.
- Erstellt von
- rowelld
- Aufrufe
- 26
- Tags
- Bewertung