⌘ WLAN standard IEEE_802.11

The newest member in the 802.11 family are the 802.11ac and the 802.11u standards

IEEE 802.11ac

802.11ac is introduced to operate in the 5 GHz band, and has, according to the Cisco White Paper, the following features:

More channel bonding, increased from the maximum of 40 MHz in 802.11n, and now up to 80 or even 160 MHz (for 117% or 333% speed-ups, respectively)
Denser modulation, now using 256 quadrature amplitude modulation (QAM), up from 802.11n's 64QAM (for a 33% speed burst at shorter, yet still usable, ranges)
More multiple input, multiple output (MIMO). Whereas 802.11n stopped at four spatial streams, 802.11ac goes all the way to eight (for another 100% speed-up).

Second-generation products should also come with a new technology, multiuser MIMO (MU-MIMO). Whereas 802.11n is like an Ethernet hub that can only transfer a single frame at a time to all its ports, MU-MIMO allows an AP to send multiple frames to multiple clients at the same time over the same frequency spectrum.

IEEE 802.11u

802.11u is a new interworking standard, and allows users to connects to access points, based on their relations to other Wifi providers. As an example: A user of "UiO" may connect to "UNIK" based on the 802.11u agreement between UiO and UNIK.

References

[Source:Cisco White Paper "801.11ac: The Fifth Generation of WiFi]

Keyword D3-WLAN Systems

D3-WLAN Systems
Broader term	Internet and Digital Transformation
Narrower terms	—
Related keywords
Also known as
Wikipedia	http://es.wikipedia.org/wiki/IEEE 802.11
All pages containing keywords

(edit page)

Contains pages with keyword "D3-WLAN Systems".

Related information

On Wikipedia

http://es.wikipedia.org/wiki/IEEE_802.11

⌘ Earlier Presentations on WLAN systems

Susana Rodriguez de Novoa:

Media:UNIK4700-Wlan.pdf
Media:An_Introduction_to_wifi.pdf
Media:radiomobile.pdf
Media:WLANSecurity.pdf‎
Book: Antennas and Propagation for Wireless Communication Systems. 2nd Edition
Book: CCNA Wireless. Oficial Exam Certification Guide

⌘"WLAN communication" 802.11

[Presentation G. Fettweis, IEEE VTC forum Baltimore], http://www.ieeevtc.org/plenaries/vtc2007fall/28.pdf

⌘ 802.11 ad standard

addresses 60 GHz communications, 5.7 GHz available bandwidth
Wavelength $λ = 0.5$ mm
antenna on chip

Application areas:

set-top boxes, TV, high-bandwidth cable replacement
direct backbone links
industrial construction area
communications in public places

Conclusions from NY University, [1]

Measurements at 38 and 60 GHz show that NLOS links can be made with steerable antennas, with 20 – 30 dB loss compared to free space line-of-sight.
A link was always made using steerable antennas within a 200 m cell radius.
38 GHz showed more NLOS links than 60 GHz
Cellular AOA distributions show BS should be deployed site-specifically (due to shadowing of buildings)
Worst RMS delay spread link was 122ns, similar for peer- to-peer and cellular