1. IEEE a b g

2. 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 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

5. a, PLCP format

6. a ,PLCP preamble

7. 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