lab 12 Thoughput limit of IEEE 802.11b

Objectives

• Thoughput limit of IEEE 802.11b
• understand the issue may affect Thoughput

Background

• Physical Layer-physical layer converage protocol(PLCP) and physical medium dependent(PMD)
  MAC
  |
  PLCP
  |
  PMD
• 802.11b MAC layer
  MAC header|DATA|CRC
  30bytes 4 bytes
• in basic mode, some proof is shown on the text book

ns2 simulation

using long preamble with packet size 2000bytes


calculate value 6.8Mbps

using short preamble with packet size 2000 bytes


calculate value 7.4Mbps


The simulation is very close to the calculate value, according to the text book.