802.11n: A Survival Guide by Matthew Gast

By Matthew Gast

Instant has eventually come of age. With an important bounce in throughput over earlier criteria, 802.11n is the 1st instant know-how that doesn’t alternate velocity 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 information 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 every single place. This e-book provides 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 facts streams enormously bring up instant speed
notice how 802.11n alterations increase MAC efficiency
research complex PHY positive aspects comparable to beanforming and space-time code block
Use complicated MAC gains to take care of interoperability with older devices
Plan an 802.11n community via deciding upon site visitors call for, key functions, energy necessities, and security
opt for the structure, pick out undefined, and plan insurance to layout and construct your network

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Space-Time Block Code (STBC) Space-Time Block Coding (STBC) can be used when the number of radio chains exceeds the number of spatial streams. 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.

Table 3-5. Feature classification of PHY features Feature Mandatory/optional? HT-Mixed Mode Mandatory HT-Greenfield mode Optional 800 ns guard interval Mandatory 400 ns (short) guard interval Optional 20 MHz channel operation Mandatory 40 MHz channel operation Optional Validated by Wi-Fi Alliance test plan and displayed on interoperability certificate. 4 GHz operation with coexistence mechanisms; about 3/4 of enterprise APs support 40 MHz channels in 5 GHz Single-stream operation (MCS 0 through MCS 7) Mandatory Wi-Fi Alliance test plan only requires 1-stream operation by client devices.

This band is sometimes referred to as the Dynamic Frequency Selection (or DFS) band after the required procedures to detect radar and avoid interfering with the allocated use of the band. 3 Use of 40 MHz channels substantially increases the demand on spectrum resources, and the ability to use 40 MHz channels will typically depend on whether the network components can support channels on which DFS operations are required. 2. 11na. 3. 11h amendments. Channel Structure and Layout | 19 Figure 3-3. 11n stations must agree on.

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