October 2012
Intermediate to advanced
160 pages
2h 49m
Chinese
Content preview from 802.11n技術手冊
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第二部分
鏈結層（MAC）
在 802.11n 以前，802.11 的 MAC 通常被視為約有 50％的效率，即意謂著在傳輸過程中
的作業資料速率，其中有一半是因為在工作站間協調傳輸所造成的各種形式協定負擔。
當資料速率相對低時，效率低落的成本是可以控制的。1 Mbps 網路的一半損失僅有 500
kbps。隨著傳輸速度持續增加，損失變得更多更顯著。802.11n 發展了數種協定特性以
回收利用一些使用效率低落的傳輸時間（Airtime）。其專注於效率的努力得到了回報：
在大多數情況下，802.11n 可以有 70％的效率。
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