Download 802.11ac: A Survival Guide by Matthew Gast PDF

By Matthew Gast

The subsequent frontier for instant LANs is 802.11ac, a regular that raises throughput past one gigabit consistent with moment. This concise consultant offers 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 specialist who led the improvement of 802.11-2012 and protection job teams on the wireless Alliance—explains how 802.11ac won't purely elevate the rate of your community, yet its capability in addition. no matter if you want to serve extra consumers along with your present point of throughput, or serve your latest customer load with better throughput, 802.11ac is the answer. This booklet will get you started.

know the way the 802.11ac protocol works to enhance the rate and potential of a instant LAN
discover how beamforming raises pace ability through enhancing hyperlink margin, and lays the root for multi-user MIMO
find out how multi-user MIMO raises means by means of permitting 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 purchaser units, purposes, and community connections

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Extra resources for 802.11ac: A Survival Guide

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Max A-MPDU Length Exponent (3 bits) This field can take on the values 0–7 and is used to communicate the size of the AMPDU that may be transmitted. The effects of its values are described in “Frame Size and Aggregation” on page 38. VHT Link Adaptation capable (2 bits) This field is used for link adaptation feedback to select the most appropriate MCS for a link using explicit feedback. Receive and Transmit Antenna Pattern Consistency (1 bit each) These bits are each set to 1 if the antenna pattern of the transmitter does not change after association completes, and 0 otherwise.

11ac is no exception. The purpose of the Signal field is to help the receiver decode the data payload, which is done by describing the parameters used for transmission. 11ac separates the signal into two different parts, called the Signal A and Signal B fields. The former is in the part of the physical layer header that is received identically by all receivers; the latter is in the part of the physical layer header that is different for each multi-user receiver. VHT Signal A field The Signal A field comes first in the frame, and it may take on one of two forms de‐ pending on whether the transmission is single-user or multi-user.

Table 2-1 identifies the OFDM carrier numbering and pilot channels. The range of the subcarriers defines the channel width itself. Each subcarrier has identical data-carrying capacity, and therefore, more is better. Pilot subcarriers are protocol overhead and are used to carry out important measure‐ ments of the channel. The table shows that as the channel size increases, the fraction of the channel devoted to pilot carriers decreases. 11ac | 13 efficient as the width increases. 11ac. Table 2-1.

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