By Matthew Gast
Instant has eventually come of age. With an important bounce in throughput over prior criteria, 802.11n is the 1st instant know-how that doesn’t alternate velocity for mobility, and clients have stormed onto instant networks with a keenness. during this concise advisor, Matthew Gast—chair of the IEEE staff 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 must plan, layout, and set up 802.11n today.
Building a community for the multitude of recent units is now a strategic choice for community engineers in all places. This ebook promises an in-depth examine key elements of 802.11n, and indicates you the way to accomplish an Ethernet-free instant office.
find out how MIMO’s a number of info streams tremendously elevate instant speed
detect how 802.11n ameliorations increase MAC efficiency
learn complex PHY gains comparable to beanforming and space-time code block
Use complex MAC positive aspects to keep up interoperability with older devices
Plan an 802.11n community by means of picking out site visitors call for, key functions, energy standards, and security
select the structure, pick out undefined, and plan insurance to layout and construct your network
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Additional resources for 802.11n: A Survival Guide
11a/g. 4. Space-Time Block Coding (STBC): This optional step, described in more detail in Chapter 4, can be used to transmit one spatial stream across two antennas for extra redundancy. The space-time block coder takes the output of the interleaver/ constellation mapper and spreads it across multiple radio chains, transforming the spatial streams into space-time streams. 5. Spatial mapping: Space-time streams are mapped onto the transmit chains by the spatial mapper. This will often be a direct mapping, in which a spatial stream becomes a space-time stream and then is mapped on to a single transmit chain.
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.
Complex phased-array antenna systems with many elements can be used as well, but such antennas have significantly higher complexity, and hence, cost. Expensive antenna arrays make a great deal of sense in mobile telephony; when used in Wi-Fi APs, the antenna array tends to lead to compromises in other areas of the system design. 34 | Chapter 4: Advanced PHY Features for Performance on the right. Interference sources from other directions will tend to be rejected by the antenna because the antenna system is pushing the gain towards the right.
802.11n: A Survival Guide by Matthew Gast