By Matthew Gast
Instant has ultimately come of age. With an important bounce in throughput over earlier criteria, 802.11n is the 1st instant know-how that doesn’t exchange pace for mobility, and clients have stormed onto instant networks with a keenness. during this concise consultant, Matthew Gast—chair of the IEEE team that produced revision 802.11-2012—shows you why instant has turn into the default approach to connecting to a community, and offers technical information you want to plan, layout, and installation 802.11n today.
Building a community for the multitude of recent units is now a strategic choice for community engineers in all places. This e-book delivers an in-depth examine key elements of 802.11n, and indicates you ways to accomplish an Ethernet-free instant office.
find out how MIMO’s a number of info streams vastly elevate instant speed
realize how 802.11n changes increase MAC efficiency
study complicated PHY gains reminiscent of beanforming and space-time code block
Use complicated MAC positive aspects to keep up interoperability with older devices
Plan an 802.11n community via identifying site visitors call for, key functions, strength specifications, and security
decide on the structure, choose undefined, and plan assurance to layout and construct your network
Read Online or Download 802.11n: A Survival Guide PDF
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Extra resources for 802.11n: A Survival Guide
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. After separating the spatial streams and de-interleaving, errors in the bit stream are corrected by the FEC and the resulting frame is passed to the MAC.
Table 2-1. 11 radio interface has to perform several tasks. When transmitting a frame, the main tasks are the inverse Fourier transform to turn the frequency-domain encoded signal into a time-domain signal, and amplification right before the signal hits the antenna so it has reasonable range. On the receive side, the process must be reversed. Immediately after entering the antenna, an amplifier boosts the faint signal received into something substantial enough to work with, and performs a Fourier transform to extract the subcarriers.
Because the speed is quite slow, however, it is not widely used in largescale networks. MCS 33 through MCS 76 (unequal modulation) Optional Transmit Beamforming Optional Not part of Wi-Fi Alliance test plan. See Chapter 4 Low-density Parity Check Optional Not part of Wi-Fi Alliance test plan. See Chapter 4 Space-Time Block Coding Optional Validated by Wi-Fi Alliance test plan and displayed on the interoperability certificate, but supported by less than 1/5 of certified 11n devices. See Chapter 4.