802.11n: A Survival Guide by Matthew Gast

By Matthew Gast

Instant has ultimately come of age. With an important leap in throughput over earlier criteria, 802.11n is the 1st instant expertise that doesn’t exchange pace for mobility, and clients have stormed onto instant networks with a fondness. during this concise consultant, Matthew Gast—chair of the IEEE workforce 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 must plan, layout, and install 802.11n today.

Building a community for the multitude of latest units is now a strategic selection for community engineers all over the place. This e-book delivers an in-depth examine key components of 802.11n, and indicates you the way to accomplish an Ethernet-free instant office.

learn the way MIMO’s a number of info streams enormously raise instant speed
observe how 802.11n differences increase MAC efficiency
research complex PHY beneficial properties equivalent to beanforming and space-time code block
Use complicated MAC beneficial properties to take care of interoperability with older devices
Plan an 802.11n community by means of identifying site visitors call for, key functions, strength necessities, and security
pick out the structure, decide upon undefined, and plan assurance to layout and construct your network

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11n for these devices because the antenna array at the AP can often boost performance through techniques like maximal ratio combining. Table 3-2. 11n. Table 3-3 and Table 3-4 show the link rate that can be achieved for various combinations of modulation, coding, and spatial streams. The table shows data rates using the long guard interval; for speeds using the optional short guard interval, add 11%. 11n, each combination is given an MCS number. These two tables only show the 30 | Chapter 3: Channels, Framing, and Coding equal modulation MCS numbers; there are many more MCS numbers that make use of unequal modulation, but they are not widely supported.

In effect, STBC transmits the same data stream twice across two spatial streams so that a receiver that misses a data block from one spatial stream has a second shot at decoding the data on the second spatial stream. In effect, Space-Time Block Code (STBC) | 37 STBC takes the gains from MIMO and uses them nearly exclusively for increased range. A single encoding stream must take two radio chains for transmission, which means that a 2×2 MIMO device transmitting with STBC is effectively operating as a singlestream device.

11n supports both equal modulation, in which all spatial streams are transmitted in the same manner, and unequal modulation, in which the spatial streams may be modulated differently. 11n defines 77 different combinations of modulation and coding. To date, most products shipped support only equal modulation modes, which are the first 32 MCS values. Table 3-3 and Table 3-4 at the end of this chapter have a list of the common MCS values, along with the link rates. Unequal modulation is useful when one spatial stream is significantly more impaired than others.

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