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- W41393281 abstract "The main goal of this thesis is to propose efficient adaptive communication mechanisms using cross layer interactions in IEEE 802. 11 WLANs. First, we present a detailed performance evaluation of 802. 11a/b PHY layer transmission modes. The second contribution of the thesis concerns 802. 11 MAC/PHY layers modelling. An analytical model that accounts for the positions of stations with respect to the access point while evaluating the performance of 802. 11 MAC layer, has been proposed. The third contribution of the thesis concerns rate adaptation mechanisms and especially cross layer algorithms between MAC and PHY layers. An adaptive rate selection algorithm, called AARF for low latency systems that improves upon ARF to provide both short-term and long-term adaptation has been proposed. In this field, we also present a new rate adaptation algorithm designed for high latency systems named AMRR that has been implemented and evaluated on an AR5212-based device. We then propose a closed-loop, dynamic rate selection algorithm that can be implemented in all 802. 11a/b/g compliant wireless local area networks. This algorithm called CLARA is a culmination of the best attributes of the transmitter-based ARF and the RBAR control mechanisms with additional practical features to facilitate multipath fading channel sensing and feedback control signalling. The last contribution of the thesis is on the optimization of real time multimedia transmission over 802. 11 based networks. In particular, we propose a simple and efficient cross layer mechanism, called MORSA, for dynamically selecting the transmission mode considering both the channel conditions and characteristics of the media." @default.
- W41393281 created "2016-06-24" @default.
- W41393281 creator A5019446590 @default.
- W41393281 date "2005-01-01" @default.
- W41393281 modified "2023-10-17" @default.
- W41393281 title "Cross layer interactions for adaptive communications in IEEE 802.11 wireless LANs" @default.
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