October 2012
Intermediate to advanced
160 pages
2h 49m
Chinese
Content preview from 802.11n技術手冊
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第三章
管制機構所頒發，其需要經過測試以確保遵循相關法規。
3
40 MHz 頻道的大量使用增加
了頻譜資源的需求，而使用 40 MHz 頻道的能力通常取決於網路元件是否可以支援在頻
道上的 DFS 作業需求。
歐洲 /
日本
美國
印度
中國
圖 3-3 可用頻道圖（5 GHz）
傳輸：調變與防護間隔
當一個訊框被發送出去時，有兩個個別的參數是 802.11n 工作站所必須要同意的。首
先，傳送器必須要選擇調變速率（Modulation Rate）和編碼（Coding），用以描述資料
將如何轉變成為無線電波。第二，傳送器必須選擇一個防護間隔（Guard Interval），
802.11n 可允許選用較先前標準短的防護間隔。
3 802.11 定義了數個協定作業以支援 DFS 的使用，最主要的為 802.11d 和 802.11h 標準的增訂。
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