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An assumption of the traditional layered protocol architecture is that all layers can be operated and optimized independently. Unfortunately, this assumption is not satisfied in wireless networks because wireless links introduce interdependence between physical (PHY) and upper layers. This paper investigates the impact of channel conditions on the performance of IEEE 802.11 DCF and proposes cross-layer optimization and design approach to improve the performance of DCF in fading channels. In this paper, a novel fade-induced packet error rate expressions based on fading statistics and error correction capability are developed. Based on these results, we propose a cross-layer analytical model to analyze the performance of IEEE 802.11 DCF in fading channels. The impact of channel conditions on the DCF performance is revealed.
Date of Conference: 25-28 Sept. 2011