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IEEE 802.11 a b g

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

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IEEE 802.11 a b g

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  1. IEEE 802.11 a b g

  2. 802.11 reference model

  3. 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

  4. ISM PHY • Clause 14 • 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

  5. 802.11 a, PLCP format

  6. 802.11 a ,PLCP preamble

  7. 802.11 b, PLCP format

  8. 802.11g, long PLCP format

  9. 802.11g, short PLCP format

  10. DSSS-OFDM PSDU

  11. 802.11g, signal segments

  12. Single carrier to multicarrier

  13. 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

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

  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

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