Abstract
This paper presents a comprehensive performance study of closed-loop fast link adaptation (FLA) in the context of IEEE 802.11n, spanning the physical (PHY) and medium-access control (MAC) layers. In particular, a semi-analytical model is derived for the widely used basic access scheme of the distributed coordination function (DCF), that applies to both, open- and closed-loop strategies. Numerical results serve to demonstrate the accuracy of the proposed model and the superiority of FLA in terms of MAC goodput in comparison to open-loop policies. Realistic operating conditions such as outdated feedback information and the use of statistical packet length distributions, issues not treated in previous studies, have also been considered. Moreover, it is shown how the inclusion of a time-out mechanism in the FLA scheme that weighs down the influence of channel information as this becomes outdated is a useful strategy to counteract its deleterious effects.
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Martorell, G., Riera-Palou, F., Femenias, G. (2011). Closed-Loop Adaptive IEEE 802.11n with PHY/MAC Cross-Layer Constraints. In: Sacchi, C., Bellalta, B., Vinel, A., Schlegel, C., Granelli, F., Zhang, Y. (eds) Multiple Access Communications. MACOM 2011. Lecture Notes in Computer Science, vol 6886. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-23795-9_6
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DOI: https://doi.org/10.1007/978-3-642-23795-9_6
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