Get 802.11n: A Survival Guide PDF

By Matthew Gast

ISBN-10: 1449312047

ISBN-13: 9781449312046

Instant has ultimately come of age. With an important leap in throughput over past criteria, 802.11n is the 1st instant expertise that doesn’t alternate pace for mobility, and clients have stormed onto instant networks with a keenness. during this concise advisor, Matthew Gast—chair of the IEEE team that produced revision 802.11-2012—shows you why instant has turn into the default approach to connecting to a community, and offers technical info you want to plan, layout, and installation 802.11n today.

Building a community for the multitude of recent units is now a strategic selection for community engineers in all places. This e-book promises an in-depth examine key elements of 802.11n, and exhibits you the way to accomplish an Ethernet-free instant office.

find out how MIMO’s a number of information streams tremendously elevate instant speed
realize how 802.11n variations enhance MAC efficiency
learn complex PHY positive aspects resembling beanforming and space-time code block
Use complex MAC gains to take care of interoperability with older devices
Plan an 802.11n community by means of deciding on site visitors call for, key purposes, energy necessities, and security
select the structure, opt for undefined, and plan assurance to layout and construct your network

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Extra info for 802.11n: A Survival Guide

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2 µs, but each symbol is shorter. 4 µs), shrinking OFDM overhead by 10% (as illustrated in Figure 3-4). Figure 3-4. 11n specification defines a physical-layer frame using the Physical Layer Convergence Protocol (PLCP). 11n PLCP supports three modes: • Non-HT mode. 11a/b/g devices. 11n features are available in this mode. 6 Some documentation refers to this as “legacy mode” because it is operating according to the exact same rules as older standards. 5. The guard interval is a common component of OFDM system design.

Implementation experience has shown that most indoor environments rarely have delay spreads of even 100 ns, and often it is closer to 50-75 ns. 11n includes an option for the short guard interval, which cuts the guard interval down to 400 ns. Whether you can successfully use the short guard interval depends on the multipath spread, which is reported by advanced RF analysis tools. In general, multipath interference is worse when there are significant reflections due to metal. 11n networks are able to use the short guard interval without issue.

One key parameter for forward-error correcting codes is the code rate, which describes the number of payload bits as a fraction of the total number of bits. For example, a code with rate R=1/2 transmits one payload bit for every two bits on the channel; in other words, out of every two bits, one is a redundant code bit added to detect and correct errors. 11n continues with the use of a convolutional code as first used in the OFDM PHY, and adds optional support for a new Low-Density Parity Check (LDPC).

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802.11n: A Survival Guide by Matthew Gast


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