標題: A cross-layer investigation for the throughput performance of CSMA/CA-Based WLANs with directional antennas and capture effect
作者: Wang, Li-Chun
Chen, Anderson
Huang, Shi-Yen
電信工程研究所
Institute of Communications Engineering
關鍵字: capture effect;cross-layer analysis;directional antenna;throughput;wireless local area network (WLAN)
公開日期: 1-Sep-2007
摘要: In this paper, we develop a physical/medium-access-control (PHY/MAC) cross-layer analytical model to investigate the throughput performance of the wireless local-area network (WLAN) in a lossy wireless environment. From the PHY-layer perspective, the developed model incorporates the effects of capture and directional antennas, while from the MAC-layer perspective, our approach takes into account the carrier-sense multiple access with collision-avoidance (CSMA/CA) MAC protocol and the effect of the backoff process in the IEEE 802.11 WLAN. We derive explicit analytical expressions for the frame outage and capture probabilities of a directional antenna system in the presence of shadowing and Rayleigh fading. Applying this analysis, we can model the interaction between the PHY and MAC layers more accurately for the infrastructure-based WLAN. The numerical results show that our analytical model can approach that attained by simulations. The proposed cross-layer analytical model not only provides insights into the PHY layer impacts on the throughput of the CSMA/CA MAC protocol but also indicates to how directional antennas can improve the CSMA/CA-based WLAN in terms of antenna beamwidth and the number of radio transceivers.
URI: http://dx.doi.org/10.1109/TVT.2007.900392
http://hdl.handle.net/11536/10357
ISSN: 0018-9545
DOI: 10.1109/TVT.2007.900392
期刊: IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
Volume: 56
Issue: 5
起始頁: 2756
結束頁: 2766
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