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 advisor, Matthew Gast—chair of the IEEE crew that produced revision 802.11-2012—shows you why instant has turn into the default approach to connecting to a community, and gives technical information you must plan, layout, and install 802.11n today.
Building a community for the multitude of recent units is now a strategic selection for community engineers all over the place. This publication can provide an in-depth examine key components of 802.11n, and indicates you ways to accomplish an Ethernet-free instant office.
learn the way MIMO’s a number of facts streams vastly elevate instant speed
observe how 802.11n changes enhance MAC efficiency
study complicated PHY good points akin to beanforming and space-time code block
Use complex MAC good points to keep up interoperability with older devices
Plan an 802.11n community by means of opting for site visitors call for, key purposes, energy necessities, and security
decide upon the structure, opt for undefined, and plan assurance to layout and construct your network
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Additional resources for 802.11n: A Survival Guide
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. 11 Wireless Networks: The Definitive Guide. 6. 11 Wireless Networks: The Definitive Guide. 22 | Chapter 3: Channels, Framing, and Coding • HT mixed mode (HT-MM). 11a/g devices. • HT-Greenfield (HT-GF) mode.
5 4. It’s even possible to combine both diversity and MIMO in the same system, but the benefits are beyond the scope of this book, and certainly beyond the scope of a sidebar. 5. Multipath is a key ingredient to the success of a MIMO system. ” That is, if there is only one path between two points, what are you going to bounce off of? 11n PHY Figure 2-2. 11a/g, called Coded OFDM. 11a/g transmission, but MIMO lets you double, triple, or quadruple up. 11n supports the use of up to four spatial streams.
An antenna array may still take the 3-stream transmission as input, but instead of mapping on to three transmit chains, the antenna may map those three inputs on to ten or more output elements. The matrix that describes the transformation from space-time streams to transmitted energy is called the steering matrix. 11n interface in Figure 3-7, the spatial mapper uses the steering matrix to alter the transmitted data to have longer reach. A similar process would be carried out within software running on the antenna system in an antenna-based beamforming system.
802.11n: A Survival Guide by Matthew Gast