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Page 1: IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to

IEEE 802.11 a b gIEEE 802.11 a b g

Page 2: IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to

802.11 reference model802.11 reference model

Page 3: IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to

Physical layer servicePhysical layer service

Physical layer convergence functionPhysical layer convergence function• Adapts PMD to PHY serviceAdapts PMD to PHY service• Physical layer convergence procedurePhysical layer convergence procedure

Map MPDU (Mac PDU) into frameMap MPDU (Mac PDU) into frame

Physical medium dependent systemPhysical medium dependent system• Define characteristics and method to Define characteristics and method to

transmit and receive datatransmit and receive data

Page 4: IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to

ISM PHYISM PHY Clause 14Clause 14

• Frequency-Hopping SS (2.4GHz ISM)Frequency-Hopping SS (2.4GHz ISM) Clause 15Clause 15

• Direct sequence SS (2.4GHz ISM)Direct sequence SS (2.4GHz ISM)• 1 or 2Mb/s1 or 2Mb/s

Clause 16Clause 16• Infrared Infrared

Clause 17 (a)Clause 17 (a)• OFDM (5GHz Unlicensed-National Information infrastructure)OFDM (5GHz Unlicensed-National Information infrastructure)• 6*, 9, 12*, 18, 24*, 36, 48, 54 Mb/s6*, 9, 12*, 18, 24*, 36, 48, 54 Mb/s

Clause 18 (b)Clause 18 (b)• High rate DSSSHigh rate DSSS• 1*, 2*, 5.5*, 11*Mb/s1*, 2*, 5.5*, 11*Mb/s

Clause 19 (g)Clause 19 (g)• Extended rate Extended rate

ERP-DSSS/CCKERP-DSSS/CCK ERP-OFDMERP-OFDM ERP-PBCC (Packet binary convolutional coding)ERP-PBCC (Packet binary convolutional coding)

• 22, 33 Mb/s22, 33 Mb/s DSSS-OFDMDSSS-OFDM

• DSSS preamble and header, OFDM payloadDSSS preamble and header, OFDM payload• 6, 9, 12, 18,24, 36, 48, 546, 9, 12, 18,24, 36, 48, 54

Page 5: IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to

802.11 a, PLCP format802.11 a, PLCP format

Page 6: IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to

802.11 a ,PLCP preamble802.11 a ,PLCP preamble

Page 7: IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to

802.11 b, PLCP format802.11 b, PLCP format

Page 8: IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to

802.11g, long PLCP format802.11g, long PLCP format

Page 9: IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to

802.11g, short PLCP format802.11g, short PLCP format

Page 10: IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to

DSSS-OFDM PSDUDSSS-OFDM PSDU

Page 11: IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to

802.11g, signal segments 802.11g, signal segments

Page 12: IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to

Single carrier to multicarrier Single carrier to multicarrier

Page 13: IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to

CTS-to-self (802.11g)CTS-to-self (802.11g)

CTS frame with RA equal to its MACCTS frame with RA equal to its MAC Overhead cost lower than CTS/RTSOverhead cost lower than CTS/RTS Less robust against hiddle nodes and colLess robust against hiddle nodes and col

lisionslisions

Page 14: IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to

aCWminaCWmin

aSlotTime long=20us, short=9usaSlotTime long=20us, short=9us aCWmin(0)=31, aCWmin(1)=15aCWmin(0)=31, aCWmin(1)=15

Page 15: IEEE 802.11 a b g. 802.11 reference model Physical layer service Physical layer convergence function Physical layer convergence function Adapts PMD to

Multi-rate supportMulti-rate support

All control frames shall be transmitted aAll control frames shall be transmitted at BSSBasicRateSett BSSBasicRateSet

All broadcast or multicast frame shall be All broadcast or multicast frame shall be transmitted at BSSBasicRateSettransmitted at BSSBasicRateSet

Control response frame at the highest raControl response frame at the highest rate in BSSBasicRateSet that <= the rate of te in BSSBasicRateSet that <= the rate of the immediately previous frame, and ththe immediately previous frame, and the same PHY optionse same PHY options

1 CSCD 439/539 Wireless Networks and Security Lecture 5 Physical Layer, and 802.11 b,g,a Differences Fall 2007

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802.11 PHY Layers 8€¦ · 802.11 PHY Layers 217 Physical Layer Operations The general operation of the various Physical layers is very similar. To perform PLCP functions, the 802.11

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Wi-Fi: Overview of the 802.11 Physical Layer and Transmitter …in.tek.com/dl/37W-29447-1.pdf · 2017-08-07 · . 3. WiFi Overview o the 802.11 Physical Layer and Transmitter Measurements