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In the last years, several strategies for maximizing the throughput performance of IEEE 802.11 networks have been proposed in literature. Specifically, it has been shown that optimizations are possible both at the Medium Access Control (MAC) layer, and at the PHYsical (PHY) Layer. In fact, at the MAC layer, it is possible to minimize the channel waste due to collisions and back-off expiration times, by tuning the minimum contention window as a function of the network congestion level. At the PHY layer, it is possible to improve the transmission robustness, by selecting a suitable modulation/coding scheme as a function of the channel quality perceived by the stations.
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