New PDF release: 802.11ac: A Survival Guide

By Matthew Gast

ISBN-10: 1449343147

ISBN-13: 9781449343149

The subsequent frontier for instant LANs is 802.11ac, a customary that raises throughput past one gigabit according to moment. This concise advisor presents in-depth info that can assist you plan for 802.11ac, with technical information on layout, community operations, deployment, and monitoring.

Author Matthew Gast—an professional who led the improvement of 802.11-2012 and safety job teams on the wireless Alliance—explains how 802.11ac won't in basic terms raise the rate of your community, yet its skill besides. no matter if you must serve extra consumers together with your present point of throughput, or serve your current shopper load with larger throughput, 802.11ac is the answer. This publication will get you started.

know how the 802.11ac protocol works to enhance the rate and skill of a instant LAN
discover how beamforming raises velocity means by way of bettering hyperlink margin, and lays the basis for multi-user MIMO
learn the way multi-user MIMO raises means through allowing an AP to ship facts to a number of consumers simultaneously
Plan whilst and the way to improve your community to 802.11ac via comparing customer units, functions, and community connections

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Additional resources for 802.11ac: A Survival Guide

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In effect, it takes MIMO gain and translates it into increased range. 24 | Chapter 2: The PHY Number of space-time streams (3 bits) This field indicates the number of space-time streams, but the field is zero-based. Therefore, the number of space-time streams will be one greater than the binary value of this field. For example, if the field is the number 3, then there are four spacetime streams. Partial AID (9 bits) For transmissions to an AP, the partial AID is the last nine bits of the BSSID.

Comparison of modulations The large number of extra points in the 256-QAM constellation point has the potential to dramatically improve speed. Instead of transmitting a maximum of six bits on each subcarrier in the channel, a 256-QAM-encoded link transmits eight bits. 11n. But nothing comes for free, and the 256-QAM speed boost is no exception. In order to use 256-QAM, the errors in the radio link must be much smaller than before. In a perfect link with ideal transmissions that are received absolutely error-free, the received points line up exactly on the constellation points, and it is easy to understand what should have been transmitted.

22 | Chapter 2: The PHY VHT Short Training Field (VHT-STF) The VHT STF serves the same purpose as the non-HT STF. Just as the first training fields help a receiver tune in the signal, the VHT-STF assists the receiver in detecting a repeating pattern and setting receiver gain. VHT Long Training Field (VHT-LTF) The VHT long training field consists of a sequence of symbols that set up demod‐ ulation of the rest of the frame, starting with the VHT Signal B field. Depending on the number of transmitted streams, it consists of 1, 2, 4, 6, or 8 symbols; the number of required symbols is rounded up to the next highest even numbered value, so a link with five streams would use six symbols.

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802.11ac: A Survival Guide by Matthew Gast


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