Download 802.11n: A Survival Guide by Matthew Gast PDF

By Matthew Gast

Instant has eventually come of age. With an important bounce in throughput over earlier criteria, 802.11n is the 1st instant expertise that doesn’t alternate velocity for mobility, and clients have stormed onto instant networks with a fondness. during this concise advisor, Matthew Gast—chair of the IEEE team 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 in all places. This publication provides an in-depth examine key elements of 802.11n, and exhibits you ways to accomplish an Ethernet-free instant office.

learn the way MIMO’s a number of info streams drastically raise instant speed
notice how 802.11n alterations increase MAC efficiency
study complex PHY positive factors akin to 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 functions, energy standards, and security
decide on the structure, choose undefined, and plan insurance to layout and construct your network

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Additional info for 802.11n: A Survival Guide

Sample text

Greenfield mode is not commonly implemented, and is best used only in cases when there are no overlapping networks. Figure 3-5. 11n frame is about to start, synchronizing timers, and antenna selection. 11 device that is capable of OFDM operation. 11a/g to describe the data rate and length in bytes of the frame. 11a/g stations compute a transmission duration from the “length” at the 6 Mbps rate, it matches the transmission duration required for the HT frame. 11n devices, as described in Chapter 5.

Implicit beamforming is based on less comprehensive measurements, and therefore, does not provide quite as high a level of performance. On the other hand, the implicit variety may be implemented by only one side of a link and may be used when that link supports a pre-11n PHY. 11 radio chips. Table 4-1. 11n APs. 11 chips in development tout support for this feature. 11n defined several methods for communicating explicit channel feedback. One method uses frames that are specifically identified as “sounding” frames, signaled as such by the sounding bit in the PLCP header.

11n devices are deployed. 11n, a similar function was originally called pure mode. All devices must support both the non-HT mode and the mixed mode. If an AP is configured to also support greenfield mode, it will be advertised in the network’s Beacon frame. 11n device can choose to use any PLCP frame format supported by the receiver. Commonly, non-HT mode is used for short frames without a payload, such as CTS and ACK frames, because it has lower overhead than either of the HT modes. 11n devices, especially those designed for enterprise use, support only mixed mode and not greenfield mode.

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