802.11ac无线技术生存指南

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"802.11ac：A.Survival.Guide(2013.7) - Matthew S. Gast" 《802.11ac：生存指南》是Matthew S. Gast撰写的一本技术书籍，专注于介绍IEEE 802.11ac无线局域网通信标准。802.11ac是802.11家族的一个重要成员，它在无线通信领域引入了显著的性能提升。这个标准的主要目标是提高无线网络的数据传输速度，以满足不断增长的高速数据需求。 802.11ac标准工作在5GHz频段，与早期的802.11a和802.11n标准相比，提供了更宽的信道带宽，从而实现更高的传输速率。802.11ac理论上的最低传输速度为1Gbps，对于单个连接来说，至少可以达到500Mbps。这个速率远超之前的802.11n标准，后者在2.4GHz或5GHz频段的最高理论速度为600Mbps。该书详细阐述了802.11ac的技术细节，包括多输入多输出（MIMO）技术、波束成形（Beamforming）、高阶调制（如256-QAM）等关键技术的应用，这些技术的结合使得802.11ac能够在无线环境中实现接近有线网络的传输效率。MIMO技术允许路由器同时向多个设备发送和接收数据，显著提高了网络容量。波束成形则能增强信号的方向性，减少干扰，提高信号质量。高阶调制则通过更复杂的编码方式，能在同样的频率资源上传输更多的信息。此外，书中可能还涵盖了802.11ac与其他802.11标准的互操作性、部署策略、安全考虑、性能优化等方面的内容。对于网络管理员、系统集成商和对无线网络感兴趣的读者，这本书提供了深入理解802.11ac标准以及如何在实际环境中有效利用它的关键信息。作为一本生存指南，作者Matthew S. Gast可能还分享了如何在不断变化的技术环境中，应对挑战和解决问题的实用技巧，帮助读者在实施802.11ac网络时避免常见的陷阱，确保网络性能和稳定性。《802.11ac：生存指南》是一本针对802.11ac标准的全面教程，不仅讲解了技术原理，还提供了实际应用的指导，对于希望理解和掌握高速无线网络技术的专业人士来说，是一份宝贵的参考资料。

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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/.

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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