Flashcards
02 802.11 PHY Layer Frame Format
Cards in this deck (51)
- 1Clause 17802.11a
OFDM - 2Clause 18802.11b
HR-DSSS and DSSS - 3Clause 19802.11g
ERP - 4Clause 20802.11n
HT - 5Sublayers of the Physical Layer1. Physical Layer Convergence Procedure
(PLCP)
2. Physical Medium Dependent (PMD) - 6Also referred to as MPDUPSDU
- 7What consists of the PPDU?1. PLCP Preamble
2. PLCP Header
3. PSDU - 8Name the three preambles.1. Long PLCP Preamble
2. Short PLCP Preamble
3. OFDM PLCP Preamble - 9Name three 802.11n preambles1. Non-HT Legacy PPDU
2. HT-mixed PPDU
3. HT-Greenfield PPDU - 10How many bits is the Long PLCP Preamble?144 bits
- 11Bit length of Long PLCP Premable Sync field128 bit
- 12Long PLCP Preamble transmitted using what modulation and data rate?DBPSK at 1 Mbps
- 13What is in the Long PLCP Preamble?1. Sync
2. SFD - 14What is in the Long PLCP Header?1. Signal
2. Service
3. Length
4. CRC - 15What modulation and data rates is the PSDU transmitted at?1 Mbps DBPSK
2 Mbps DQPSK
5.5 Mbps
11 Mbps - 16What is in a Short PLCP Preamble?1. shortSYNC
2. shortSFD - 17What is in the Short PLCP Header?1. Signal
2. Service
3. Length
3. CRC - 18At what data rate is the short PLCP Preamble transmitted?1 Mbps
- 19At what data rate is the Short PLCP Preamble Header transmitted?2 Mbps
- 20What data rates are used to transmit a PSDU?2 Mbps
5.5 Mbps
11 Mbps - 21Define OFDM PLCP Preamble10 short symbols and 10 long symbols.
Short OFDM training symbol is about 10 subscribers.
Long OFDM training symbol consists of 53 subscribers. - 22What does the Signal field define in the PLCP Header?Indicates modulation method being used.
- 23OFDM PLCP Header service field length.24 bits
- 24Non-HT Legacy PPDU is defined by which clause?Clause 17
- 25Non-HT Legacy PPDU preamble consists of10 short symbols
2 long symbols - 26HT-Mixed PPDU backwards compatible to which clauses?Clause 17
Clause 19 - 27Support for HT-Greenfield PPDUOptional
- 28Width of 2.4 GHz Communication83.5 MHz
- 29Frequencies for Clause 192.4000 GHz to 2.4835 GHz
- 30Width of 2.4 GHz frequency22 MHz
- 312.4 GHz separation width for non-overlapping channels?25 MHz
- 32Width of UNII-1,2,3 band.100 MHz
- 33Width of 802.11h, UNII-2 Extended.255 MHz
- 34Radios that can transmit on 5 GHz802.11a OFDM Clause 17
802.11h (TPC and DFS)
802.11n (HT clause 20) - 35How man non-overlapping channels in UNII1,2, and 3?4
- 36Center of outermost channel on UNII-1 and 2?30 MHz from band's edge
- 37Center of the outermost channels for UNII-320 MHz
- 38Clause 14FHSS
- 39Clause 14 data rates1, and 2 Mbps
- 40Clause 15 data rates1 Mbps
2 Mbps - 41Clause 18 data rates5.5 Mbps
11 Mbps - 42Clause 15 ModulationDBPSK
DQPSK - 43Clause 17 subcarrier frequency width312.5 KHz
- 44Number of subcarriers in Clause 1752
48 to transfer
Other 4 are pilot carriers - 45Error correction used in Clause 17Convolutional coding, FEC - forward error correction.
- 46Modulation used by Clause 17BPSK
QPSK
16-QAM
64-QAM - 47Clause 18 data rates5.5 Mbps
11 Mbps - 48Modulation used by Clause 18DBPSK
DQPSK - 49Data rate used for Clause 18 modulation1 Mbps
2 Mbps - 50Error correction used in Clause 18Convolutional Code Keying
- 51Clause 19 Mandator 2.4 GHz data rates6 Mbps
12 Mbps
24 Mbps
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- CWAP CWAP Flashcards on 02 802.11 PHY Layer Frame Format, created by rowelld on 23/02/2016.
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