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The IEEE 802.11 WLANs are being deployed widely and rapidly in many different environments. In the standards of IEEE 802.11 wireless networks, there are many optional design factors or parameters such as modulation schemes and transmission rates in the PHY layer, maximal number of retransmission tries, initial contention window size, and packet length in the MAC layer. While each layer's flexibility or adaptiveness to enable versatile products may be of primary concern in the protocols of wired networks, the integrated design of the whole systems across different layers to achieve optimal performance in some sense becomes important for wireless networks.
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