Physical layer effects on the MAC goodput performance for the rate adaptive IEEE 802.11a/g WLAN

Wei Cheng Liu*, Li-Chun Wang, Ya Wen Lin

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

15 Scopus citations

Abstract

According to the IEEE 802.11a, the next generation wireless local area networks (WLAN) aim to support data rates at least 100 Mbps, as measured at the medium access control (MAC) layer. Thus, it is important to develop a cross-layer analytical model to evaluate the MAC layer goodput performance with consideration of the physical layer effects. This paper suggests such an analytical model to calculate the MAC layer goodput for the IEEE 802.11a WLAN in the Nakagami fading channel, while incorporating the effects of channel estimation, delay spread and signal detection scheme in the physical layer. Furthermore, we develop a simple and efficient channel-driven rate adaptation (CDRA) scheme to dynamically adjust the transmission parameters to maximize the MAC layer goodput. From out numerical results, we find that some physical (PHY) modes in the IEEE 802.11a are unnecessary. We also find that as rms delay spread increases, the goodput in the MAC layer can be improved due to frequency diversity. For the case of rms delay spread changing from 50 to 200 nsec with 15 dB Eb/N0, the goodput is improved from 12 Mbps to 15 Mbps.

Original languageEnglish
Title of host publication2004 IEEE Wireless Communications and Networking Conference, WCNC 2004
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1873-1878
Number of pages6
Volume3
ISBN (Print)0780383443
DOIs
StatePublished - 27 Sep 2004
Event2004 IEEE Wireless Communications and Networking Conference, WCNC 2004 - Atlanta, GA, United States
Duration: 21 Mar 200425 Mar 2004

Conference

Conference2004 IEEE Wireless Communications and Networking Conference, WCNC 2004
CountryUnited States
CityAtlanta, GA
Period21/03/0425/03/04

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