802.11ac技术详解：高速无线接入指南

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"802.11 AC：生存指南，由Matthew S. Gast撰写，讲述了802.11ac标准的功能、速度以及在实现高速无线接入中的应用。" 802.11ac是无线局域网（WLAN）通信标准的一个版本，由IEEE（电气和电子工程师协会）制定，旨在提升无线网络的数据传输速度和效率。相比于前一代802.11n，802.11ac实现了显著的性能提升，尤其是在家庭、办公室和公共Wi-Fi热点等环境中。 802.11ac的主要特点和优势： 1. **更高的数据速率**：802.11ac的最大理论速度可达1.3Gbps（千兆比特每秒），远超过802.11n的600Mbps，提供了更快的文件传输和流媒体服务。 2. **多输入多输出（MIMO）技术**：802.11ac采用了更高阶的MIMO技术，即支持最多8个空间流，相比于802.11n的4个空间流，提升了网络容量和覆盖范围。 3. **更宽的频带宽度**：802.11ac工作在5GHz频段，使用了更宽的20MHz、40MHz、80MHz甚至160MHz的信道宽度，从而实现更高的数据速率。 4. **波束成形（Beamforming）**：这项技术提高了信号的方向性和强度，使无线信号能更有效地到达设备，减少了干扰并增强了连接稳定性。 5. **兼容性**：802.11ac设计为向后兼容802.11a/n设备，确保旧设备在新的802.11ac网络中仍能正常工作。在"802.11ac: A Survival Guide"这本书中，作者Matthew S. Gast深入浅出地介绍了802.11ac的工作原理、实施策略以及如何优化无线网络性能。读者可以了解到如何配置和部署802.11ac网络，以及如何解决可能遇到的干扰和性能问题，实现WiFi的无缝连接。书中的内容可能涵盖了以下方面： - 802.11ac标准的技术细节，包括物理层和MAC层的改进。 - 实际应用案例，展示802.11ac在高流量环境（如大型公共场所或企业网络）中的表现。 - 网络规划和设计，如何根据环境选择合适的设备和配置。 - 网络安全和性能优化，如何确保数据的安全传输并最大化网络效率。 - 解决方案和最佳实践，帮助读者解决实际部署中可能遇到的问题。通过阅读这本书，无论是IT专业人士还是对无线网络感兴趣的普通用户，都能获得802.11ac的全面知识，以实现更高效、更可靠的高速无线接入。

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Acknowledgments

This is my second book written with Meg Blanchette as editor. Meg kept the book

moving along as best she could, which is no small feat given that I successfully pursued

a pilot cetificate as I wrote this book. Meg regularly sought out opportunities for me to

experiment as an author, most notably by encouraging me to participate in the early

release program starting six months before the book’s final release. All the delays in

publication are due entirely to my preoccupation with aviation, and would no doubt

have been much worse without Meg’s diligent efforts to keep me on track.

I could not have asked for better readers to keep me motivated. As a direct result of all

the notes and questions that I received, the book grew substantially during the review

cycle. The review team included several 802.11 luminaries who are famous in their own

right. My all-star review team consisted of (in alphabetical order, so I do not need to try

and rank their many valuable and varied contributions in any sort of order):

Joe Fraher

Joe is a technical writer and colleague of mine at Aerohive, where he consistently

produces documentation that is lucid, complete, and easy to use. Unlike me, he has

mastered all the tools of his trade and handles the whole project from start to finish.

One of Joe’s main contributions to the finished product you now hold is that he

does not let me get away with glossing over anything. If you find that the book is

consistent and complete, your thanks are properly given to Joe.

Changming Liu

Changming is the CTO at Aerohive, and a fountain of ideas both for Aerohive’s

customers, and for me personally. I cannot name a conversation with him that I did

not wish were longer.

Chris Lyttle

Chris heads up the wireless LAN practice at a major integrator, where he helps

customers figure out how to use the technology that we build as an industry. Along

the way, he chronicles the journey on his blog at Wi-Fi Kiwi, sharing valuable bits

of information with anybody who is trying to run a wireless LAN.

xiv | Preface

2. Matthew also wrote the nicest thing I’ve ever read about my writing on his own blog at http://www.insearch

oftech.com/2013/04/11/the-curse-of-matthews-books/.

3. Adrian is English, so I deviate from the American spelling just to show him that I can be bilingual.

Craig Mathias

At the Farpoint Group, Craig has been a prolific writer on 802.11 for many years.

I am indebted to him for his many kind words over the years, and the encourage‐

ment he has always given me to continue writing on 802.11. Craig has asked me to

be on many panels at industry events over the years, and has never failed to promote

my books in his thoughtful introductions. As an analyst on the cutting edge, Craig

is able to talk about new developments throughout the development process.

Matthew Norwood

Matthew, a senior technologist at an integrator, is one of the many people in the

industry who has to do useful things with the crazy collection of technology parts

we create. His networking mad science, which is about many components in ad‐

dition to wireless LANs, unfolds at In Search of Tech.

Matthew brought the sen‐

sibility of an expert network engineer to the book, and his review of the planning

and integration parts of this book was particularly valuable.

Adrian Stephens

Adrian is one of the leaders of the 802.11 working group, where he has consistently

used computers to save work instead of creating more of it. Talking to Adrian is

like dropping questions into a deep well of technical knowledge. (For the record, I

have yet to find the bottom.) I benefited from Adrian’s prodigious knowledge when

we worked together on the 802.11-2012 revision, and he continues to serve the

802.11 community in ways too numerous to count. His comments on advanced

MAC features and beamforming particularly strengthened the text, and his

humourous

comments added levity to the long slog of finishing the book, the effect

of which was to help me see the light at the end of the tunnel.

Tim Zimmerman

Tim is an analyst with a technology advisory firm, and one of the most plugged-in

people in the Wi-Fi industry. I am grateful for his time, and his many comments

expanded multiple parts of the book in ways that will benefit you.

Preface | xv

In addition to the formal review team, I benefited from the assistance of many other

readers. Early release readers came from all across the world. Some of the most helpful

were:

Jeff Haydel

Jeff is a talented field engineer for Aerohive, and was all that an author could ask

for in an early release reader. He religiously read multiple drafts of the book, and

was particularly helpful in striking the right balance between remaining faithful to

the specification while trying to be concise and comprehensible.

Colleen Szymanik

Colleen Szymanik runs one of the largest and most complex wireless networks in

the world, and her comments kept me focused on how to keep the book focused

on information that would help working network administrators everywhere.

Ben Wilson

My colleague Ben Wilson has helped deploy more wireless networks than I care to

count. His work takes him all across the UK, and I cannot figure out how he found

time to review the book, let alone offer numerous useful suggestions.

One of the advantages of publishing the book early was that readers were able to interact

with each other, both in person and on blogs. As I was working on incorporating tech‐

nical review comments, I finally met Lee Badman face-to-face at Interop, and our brief

discussion was critical to refining my thinking about the connectivity that will support

future generations of 802.11ac access points.

I am grateful to readers who served as valuable sanity checks during the writing process,

and helped keep me as focused as possible on the end goal. Terry Simons, who works

on wireless LAN integration for Nest Labs, found the time to review the draft of this

book and give me the detailed technical feedback of somebody who knows what it takes

to make Wi-Fi just work. Tom Hollingsworth offered encouragement at a critical junc‐

ture. Michele Chubirka, the security podcaster for Packet Pushers, provided a much-

welcomed reality check during the middle of the long twilight of the book. Kelly Davis-

Felner and Bill Solominsky at the Wi-Fi Alliance offered encouragement both in person

at the Wi-Fi Alliance meeting where much of this book was written, and by drafting me

into writing for the Wi-Fi Alliance on 802.11ac.

xvi | Preface

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