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IEEE 802.11a-1999 or 802.11a was an amendment to the IEEE 802.11 wireless local network specifications that defined requirements for an orthogonal frequency-division multiplexing (OFDM) communication system. It was originally designed to support wireless communication in the unlicensed national information infrastructure (U-NII) bands (in the 5 ...
802.11a: 1999 5 (Wi-Fi 1)* 802.11b: 1999 1–11 2.4 (Wi-Fi 0)* 802.11: 1997 1–2 2.4 *Wi‑Fi 0, 1, 2, and 3 are named by retroactive inference. They do not exist in the official nomenclature.
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IEEE 802.11a 或标准称之为 IEEE 802.11a-1999 ，是 802.11 原始标准 的一个修订标准，于1999年获得批准。 描述. 802.11a标准采用了与原始标准相同的核心协议，工作频率为5GHz，使用52个 正交频分多路复用 （OFDM）副载波 [7] ，最大原始数据传输率为54Mb/s，这达到了现实网络中等吞吐量（20Mb/s）的要求。 如果需要的话，数据率可降为48，36，24，18，12，9或者6Mb/s。 802.11a拥有12条不相互重叠的频道，8条用于室内，4条用于点对点传输。 它不能与 IEEE 802.11b 进行互操作，除非使用了对两种标准都采用的设备。 由于2.4GHz频带已经被到处使用，采用5GHz的频带让802.11a具有更少冲突的优点。
IEEE 802.11 (legacy mode) – or more correctly IEEE 802.11-1997 or IEEE 802.11-1999 – refer to the original version of the IEEE 802.11 wireless networking standard released in 1997 and clarified in 1999. Most of the protocols described by this early version are rarely used today.
Sep 16, 1999 · This amendment defines modifications to both the IEEE Std 802.11 physical layer (PHY) and the IEEE Std 802.11 Medium Access Control (MAC). The amendment specifies enhancements for an Ultra High Reliability capability in a Wireless Local Area Network (WLAN).
Abstract: Changes and additions to IEEE Std. 802.11-1999 are provided to support the new highrate physical layer (PHY) for operation in the 5 GHz band. Scope: To develop a Higher Speed PHY for use in fixed, moving or portable Wireless Local Area Networks.
Wi-Fi ( / ˈwaɪfaɪ /) [1] [a] is a family of wireless network protocols based on the IEEE 802.11 family of standards, which are commonly used for local area networking of devices and Internet access, allowing nearby digital devices to exchange data by radio waves.
