IEEE 802.11 a b g.

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Presentation transcript:

IEEE 802.11 a b g

802.11 reference model

Physical layer service Physical layer convergence function Adapts PMD to PHY service Physical layer convergence procedure Map MPDU (Mac PDU) into frame Physical medium dependent system Define characteristics and method to transmit and receive data

ISM PHY Clause 14 Clause 15 Clause 16 Clause 17 (a) Clause 18 (b) Frequency-Hopping SS (2.4GHz ISM) Clause 15 Direct sequence SS (2.4GHz ISM) 1 or 2Mb/s Clause 16 Infrared Clause 17 (a) OFDM (5GHz Unlicensed-National Information infrastructure) 6*, 9, 12*, 18, 24*, 36, 48, 54 Mb/s Clause 18 (b) High rate DSSS 1*, 2*, 5.5*, 11*Mb/s Clause 19 (g) Extended rate ERP-DSSS/CCK ERP-OFDM ERP-PBCC (Packet binary convolutional coding) 22, 33 Mb/s DSSS-OFDM DSSS preamble and header, OFDM payload 6, 9, 12, 18,24, 36, 48, 54

802.11 a, PLCP format

802.11 a ,PLCP preamble

802.11 b, PLCP format

802.11g, long PLCP format

802.11g, short PLCP format

DSSS-OFDM PSDU

802.11g, signal segments

Single carrier to multicarrier

CTS-to-self (802.11g) CTS frame with RA equal to its MAC Overhead cost lower than CTS/RTS Less robust against hiddle nodes and collisions

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

Multi-rate support All control frames shall be transmitted at BSSBasicRateSet All broadcast or multicast frame shall be transmitted at BSSBasicRateSet Control response frame at the highest rate in BSSBasicRateSet that <= the rate of the immediately previous frame, and the same PHY options