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Performance Analysis of IEEE 802.11 DCF in Imperfect Channels

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4 Author(s)
Yu Zheng ; Dept. of Electr. & Comput. Eng., Univ. of Florida, Gainesville, FL ; Kejie Lu ; Dapeng Wu ; Yuguang Fang

IEEE 802.11 is the most important standard for wireless local area networks (WLANs). In IEEE 802.11, the fundamental medium access control (MAC) scheme is the distributed coordination function (DCF). To understand the performance of WLANs, it is important to analyze IEEE 802.11 DCF. Recently, several analytical models have been proposed to evaluate the performance of DCF under different incoming traffic conditions. However, to the best of the authors' knowledge, there is no accurate model that takes into account both the incoming traffic loads and the effect of imperfect wireless channels, in which unsuccessful packet delivery may occur due to bit transmission errors. In this paper, the authors address this issue and provide an analytical model to evaluate the performance of DCF in imperfect wireless channels. The authors consider the impact of different factors together, including the binary exponential backoff mechanism in DCF, various incoming traffic loads, distribution of incoming packet size, queueing system at the MAC layer, and the imperfect wireless channels, which has never been done before. Extensive simulation and analysis results show that the proposed analytical model can accurately predict the delay and throughput performance of IEEE 802.11 DCF under different channel and traffic conditions

Published in:

Vehicular Technology, IEEE Transactions on  (Volume:55 ,  Issue: 5 )

Date of Publication:

Sept. 2006

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