IEEE802.11n：无线局域网高吞吐量增强标准草案
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IEEE802.11n是无线局域网（WLAN）技术的一个重要标准，旨在显著提升无线网络的数据传输速度和性能。该标准由电气和电子工程师协会（IEEE）制定，并在2009年发布。它的目标是通过多种技术创新来提高无线网络的吞吐量，从而实现高达600Mbps的实际数据传输速率，比之前的802.11a/b/g标准有了显著提升。
802.11n标准采用了多输入多输出（MIMO）技术，这是它能大幅提高速度的关键。MIMO利用多个天线同时发送和接收信号，通过空间多重载波和空间分集来增强信号质量和可靠性。这种技术能够利用无线信号的反射和折射，使多个数据流并行传输，从而提高了传输效率。
除了MIMO，802.11n还引入了其他增强功能，如信道绑定（Channel Bonding）。它允许无线设备使用两个或四个20MHz的频段，合并成一个更宽的40MHz或80MHz频道，进一步提升了带宽。此外，802.11n也支持帧聚合（Frame Aggregation），即将多个小的数据包组合成一个大帧进行传输，减少了传输中的开销和延迟。
802.11n协议采用了正交频分复用（OFDM）调制技术，这是802.11a/g中就已经使用的技术，但802.11n对其进行了优化，提供了更高的编码效率和更多的子载波，增强了信号的抗干扰能力。为了保证向后兼容，802.11n标准还包含了对802.11a/b/g模式的支持。
在物理层（PHY）和介质访问控制（MAC）层，802.11n做了许多改进以提高效率和性能。例如，它引入了短格式的前导和同步字段，减少了每个数据包的头部开销。此外，802.11n还规定了新的服务质量（QoS）机制，确保实时应用如视频流和在线游戏的顺畅运行。
总结来说，IEEE802.11n协议通过采用MIMO技术、信道绑定、帧聚合、OFDM优化等手段，极大地提高了无线网络的速度和可靠性，为家庭、办公室以及公共场所的高速无线连接奠定了基础。尽管后续还有802.11ac和802.11ax等更新的标准，但802.11n至今仍广泛应用于各种无线设备，是现代无线网络发展的重要里程碑。
IEEE P802.11n/D11.0, June 2009
xvi Copyright © 2009 IEEE. All rights reserved.
This is an unapproved IEEE Standards Draft, subject to change.
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11.17 RSNA A-MSDU procedures ............................................................................................... 242
11.18 Public Action frame addressing........................................................................................... 242
12. PHY service specification................................................................................................................ 244
12.3 Detailed PHY service specifications.................................................................................... 244
12.3.4 Basic service and options..................................................................................... 244
12.3.4.2 PHY-SAP sublayer-to-sublayer service primitives ......................... 244
12.3.4.3 PHY-SAP service primitives parameters......................................... 244
12.3.4.4 Vector descriptions .......................................................................... 244
12.3.5 PHY-SAP detailed service specification ............................................................. 245
12.3.5.4 PHY-TXSTART.request.................................................................. 245
12.3.5.4.1 Function ................................................................... 245
12.3.5.4.2 Semantics of the service primitive........................... 245
12.3.5.4.3 When generated ....................................................... 245
12.3.5.6 PHY-TXEND.request ...................................................................... 246
12.3.5.6.1 Function ................................................................... 246
12.3.5.6.2 When generated ....................................................... 246
12.3.5.7 PHY-TXEND.confirm..................................................................... 246
12.3.5.7.3 When generated ....................................................... 246
12.3.5.10 PHY-CCA.indication....................................................................... 246
12.3.5.10.2 Semantics of the service primitive........................... 246
12.3.5.10.3 When generated ....................................................... 246
12.3.5.12 PHY-RXEND.indication ................................................................. 247
12.3.5.12.1 Function ................................................................... 247
12.3.5.12.2 Semantics of the service primitive........................... 247
12.3.5.13 PHY-CONFIG.request..................................................................... 247
12.3.5.13.1 Function ................................................................... 247
12.3.5.13.2 Semantics of the service primitive........................... 247
12.3.5.13.3 When generated ....................................................... 248
12.3.5.13.4 Effect of receipt ....................................................... 248
12.3.5.14 PHY-CONFIG.confirm.................................................................... 248
12.3.5.14.1 Function ................................................................... 248
12.3.5.14.2 Semantics of the service primitive........................... 248
12.3.5.14.3 When generated ....................................................... 248
12.3.5.14.4 Effect of receipt ....................................................... 248
20. High Throughput (HT) PHY specification ...................................................................................... 249
20.1 Introduction.......................................................................................................................... 249
20.1.1 Introduction to the HT PHY ................................................................................ 249
20.1.2 Scope.................................................................................................................... 249
20.1.3 HT PHY functions ............................................................................................... 249
20.1.3.1 HT PLCP sublayer ........................................................................... 250
20.1.3.2 HT PMD sublayer............................................................................ 250
20.1.3.3 PHY management entity (PLME).................................................... 250
20.1.3.4 Service specification method ........................................................... 250
20.1.4 PPDU Formats ..................................................................................................... 250
20.2 HT PHY service interface....................................................................................................251
20.2.1 Introduction.......................................................................................................... 251
20.2.2 TXVECTOR and RXVECTOR parameters ........................................................ 251
20.2.3 Effect of CH_BANDWIDTH, CH_OFFSET and MCS parameters on PPDU format
258
20.2.4 Support for NON_HT formats ............................................................................. 259
Authorized licensed use limited to: Rose Kung. Downloaded on July 23, 2009 at 20:14 from IEEE Xplore. Restrictions apply.
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