By Matthew Gast
Instant has ultimately come of age. With an important bounce in throughput over earlier criteria, 802.11n is the 1st instant expertise that doesn’t alternate pace for mobility, and clients have stormed onto instant networks with a keenness. during this concise advisor, Matthew Gast—chair of the IEEE crew that produced revision 802.11-2012—shows you why instant has turn into the default approach to connecting to a community, and offers technical info you want to plan, layout, and installation 802.11n today.
Building a community for the multitude of latest units is now a strategic choice for community engineers far and wide. This booklet delivers an in-depth examine key components of 802.11n, and exhibits you the way to accomplish an Ethernet-free instant office.
learn the way MIMO’s a number of info streams drastically elevate instant speed
observe how 802.11n differences increase MAC efficiency
study complicated PHY good points corresponding to beanforming and space-time code block
Use complex MAC positive aspects to take care of interoperability with older devices
Plan an 802.11n community through picking out site visitors call for, key purposes, strength specifications, and security
decide on the structure, opt for undefined, and plan assurance to layout and construct your network
Read or Download 802.11n: A Survival Guide PDF
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Extra info for 802.11n: A Survival Guide
STBC (2 bits) Space-Time Block Coding allows multiple radio chains to be used to increase the sensitivity to a single data stream; it is further described in Chapter 4. Forward Error Correction coding (1 bit) When using a convolutional code, this bit is set to 0; to use LDPC, the bit is set to 1. Short guard interval (1 bit) When the short guard interval is in use, this bit is set to 1. When set to 0, it indicates the long guard interval is in use. CRC (8 bits) A CRC allows the receiver to detect corruption of the HT Signal field.
To form a beam in one direction, the result is often a figure-8 coverage pattern, as shown in the figure. Figure 4-1. Conceptual process of beamforming In essence, beamforming is an electrically steerable antenna. When transmitting to a given receiver, the antenna is “pointed” in the direction of the receiver, but the direction that the beam is focused can be controlled by subtly altering the phase shifts into the antenna system rather than mechanically moving the antenna. 11 chip. When the transmission is biased towards transmission in one direction, it tends to have a relatively low sensitivity in the opposite direction.
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. 11n PLCP operating modes is illustrated in Figure 3-5. 11a/g mode, and HT Mixed Mode is by far the most common method. HT-Greenfield mode is shown for reference. Greenfield mode is not commonly implemented, and is best used only in cases when there are no overlapping networks.