Transmission Behavior of IEEE 802.11 WLAN Stations in the String Topology

• Main Authors: Hsin-Chiao Liu, 劉心喬
• Other Authors: Ting-Chao Hou
• Format: Others
• Language: en_US
• Published: 2003
• Online Access: http://ndltd.ncl.edu.tw/handle/71287577801694537882

碩士 === 國立中正大學 === 電機工程研究所 === 91 === A wireless LAN (WLAN)is a local area network of computers that communicate through short-range radio or infrared signals.The IEEE 802.11 is a standard for the WLAN which de fines the physical layer and the medium access control layer (MAC) speci fications.The 802.11 MAC layer has two sub-layers:distributed coordination function (DCF)and point coordination function (PCF).The DCF is based on a mul-tiple access scheme called CSMA/CA (Carrier Sense Multiple Access with Collision Avoidance).In order to avoid collisions of packets due to the hidden terminal problem, RTS (request-to-send) and CTS (clear-to-send) control frames are exchanged between the sender and the receiver to reserve the channel.In the multi-hop ad hoc networks,the exchange of these two control frames can especially improve the performance.In this thesis,we propose a mathematical analysis for evaluating the throughput of a wireless multi-hop ad hoc network with the string topology.The simulation results show that this numerical analysis is adequate to model it.We also provide an alternative method to model the string topology.