October 2012
Intermediate to advanced
160 pages
2h 49m
Chinese
Content preview from 802.11n技術手冊
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第八章
HT 重複模式（MCS 32）
HT 重複（Duplicate）模式改善了錯誤率的效能。它是由一種運作在 6 Mbps 的模式
所組成，在一個 40 MHz 頻道的各半都發送著相同的資料串流。只有五分之一不到
的認證設備實作該模式，所以不在本書詳細討論。
實作單空間串流的 802.11n 存取點不能宣稱它經過 802.11n 認證。然而作為一種妥協，
如果 AP 通過本節介紹的任何測試，就可以視為通過認證並且使用標章以表明其「具備
部分 n 特性（with some n feature）」。例如一個實作單串流的 802.11n 設備並且支援 40
MHz 頻道，那麼就可以標記「Wi-Fi CERTIFIED 802.11a/b/g 具備部分 n 特性」。
在 802.11n 認證中未經測試的特性
Wi-Fi 聯盟於 802.11n 設備互通性測試裡並不包含部分協定特性，值得注意的是，
四串流作業與波束成形都不是 Wi-Fi CERTIFIED n 測試計畫的一部分。Wi-Fi 聯盟
的測試是藉由撰寫最常見特性的測試計畫，並且組裝實現這些特性設備的「測試
平台」。為了保證最大限度的互通性，測試平台會由數個不同廠商的設備所組成，
因此相同應用的軟體和硬體都會是獨立的實作。在撰寫本書的 2011 年底，四串流
作業與波束成形的支援沒有得到業界廣泛的支持。
覆蓋與容量規劃（Coverage and Capacity Planning）
當 802.11n 首度出現，無線電規劃便是一個複雜的工作，因為它需要工匠大師巡迴建築 ...
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