802.11n: A Survival Guide by Matthew Gast

By Matthew Gast

Instant has eventually come of age. With an important leap in throughput over earlier criteria, 802.11n is the 1st instant expertise that doesn’t exchange 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 develop into the default approach to connecting to a community, and offers technical info you want to plan, layout, and install 802.11n today.

Building a community for the multitude of recent units is now a strategic selection for community engineers far and wide. This ebook provides 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 information streams tremendously bring up instant speed
become aware of how 802.11n transformations increase MAC efficiency
study complex PHY beneficial properties similar to beanforming and space-time code block
Use complex MAC beneficial properties to take care of interoperability with older devices
Plan an 802.11n community by means of opting for site visitors call for, key purposes, energy standards, and security
opt for the structure, choose undefined, and plan assurance to layout and construct your network

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HT Long Training Field (HT-LTF) There are two types of HT-LTF: a Data LTF and an optional Extension LTF used in channel sounding frames as part of transmit beamforming. As with the non-HT LTF, the HT LTF helps tune the MIMO system so that spatial streams can be decoded. In most cases, the extension LTFs are not present. One HT LTF is present for one spatial stream, two HT LTFs are present for two spatial streams, and four HT LTFs are present for three or four spatial streams. Extension LTFs are used to excite spatial streams for transmit beamforming, which is why they are not commonly used.

11n devices? For simplicity, this section will quote link rates using the long guard interval. It is the default setting on most equipment, and is generally safer to use. The performance boost for switching to the short guard interval about 11%, which is substantial only in environments where the radio channel is saturated. 11n products. This data rate was widely available in products that began shipping in 2011. 11n standard, even if no products based on that data rate have yet been sold. 11n for cost reasons.

11n, most access points were equipped by default with omnidirectional antennas. “Omnis” radiate equally in all directions, and their coverage is often depicted 33 as a circle with the AP at the center. One of the costs of of an omni is that the signal destined to a receiver is sprayed out evenly in all directions, even though the receiver is only in one of those directions. The best way I have found to explain it is to recall John Wanamaker’s famous statement that half of all advertising spending is wasted, but the problem is that nobody knows which half goes to waste.

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