April 20, 2017

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 know-how that doesn’t exchange velocity for mobility, and clients have stormed onto instant networks with a keenness. 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 gives technical info you must plan, layout, and install 802.11n today.

Building a community for the multitude of recent units is now a strategic choice for community engineers all over the place. This e-book offers 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 facts streams drastically elevate instant speed
become aware of how 802.11n ameliorations increase MAC efficiency
research complex PHY good points akin to beanforming and space-time code block
Use complex MAC good points to take care of interoperability with older devices
Plan an 802.11n community through picking out site visitors call for, key purposes, energy necessities, and security
decide on the structure, decide upon undefined, and plan assurance to layout and construct your network

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Additional resources for 802.11n: A Survival Guide

Example text

For a bit more background with pictures, see my video about QAM and error vector magnitude. 28 | Chapter 3: Channels, Framing, and Coding 7. 11a/g. 8. Finally, the radio section amplifies the signal for transmission out an antenna. At this stage, the final data signal is available and can be placed on to the carrier. A high power amplifier (HPA) increases the power so the signal can travel as far as needed, within regulatory limits. To receive a frame, the transceiver reverses the steps. A weak signal from the antenna is boosted by a Low-Noise Amplifier (LNA) so that the symbols can be recovered with a Fourier transform.

22 | Chapter 3: Channels, Framing, and Coding • HT mixed mode (HT-MM). 11a/g devices. • HT-Greenfield (HT-GF) mode. 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.

11a/g? 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.

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