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Wireless LAN (WLAN) channels are frequently accessed using IEEE 802.11 protocols. The 802.11 standard provides several radio frequency bands for use in Wi-Fi communications, each divided into a multitude of channels numbered at 5 MHz spacing (except in the 45/60 GHz band, where they are 0.54/1.08/2.16 GHz apart) between the centre frequency of the channel.
IEEE 802.11ac-2013 or 802.11ac is a wireless networking standard in the IEEE 802.11 set of protocols (which is part of the Wi-Fi networking family), providing high-throughput wireless local area networks (WLANs) on the 5 GHz band. [c] The standard has been retroactively labelled as Wi-Fi 5 by Wi-Fi Alliance. [9] [10]
In the USA, CFR Title 47 Part 15 (revised in 2005) describes the regulation of the U-NII bands. The FCC's U-NII regulations for 5 GHz wireless operation in the USA. RadioElectronics' article on Wi-Fi / WLAN Channels, Frequencies, Bands & Bandwidths; Air802's article with tables of data on FCC Rules and Regulations which specifies frequencies ...
The 802.11ac standard was retroactively labelled as Wi-Fi 5 by the Wi-Fi Alliance. [ 45 ] [ 46 ] Changes compared to 802.11n include wider channels (80 or 160 MHz versus 40 MHz) in the 5 GHz band, more spatial streams (up to eight versus four), higher-order modulation (up to 256- QAM vs. 64-QAM), and the addition of Multi-user MIMO (MU-MIMO).
Wi-Fi 6, or IEEE 802.11ax, is an IEEE standard from the Wi-Fi Alliance, for wireless networks . It operates in the 2.4 GHz and 5 GHz bands, [ 9 ] with an extended version, Wi-Fi 6E , that adds the 6 GHz band. [ 10 ]
The Wi-Fi Alliance has also retroactively labelled the technology for the standard as Wi-Fi 4. [ 9 ] [ 10 ] It standardized support for multiple-input multiple-output (MIMO), frame aggregation , and security improvements, among other features, and can be used in the 2.4 GHz or 5 GHz frequency bands.
These frequency bands include the same 2.4 GHz bands used by equipment such ... 802.11–2012, 802.11ac (Wi-Fi 5), [54] 802.11ad, 802.11af, 802.11-2016, 802.11ah ...
The 802.11a standard uses the same core protocol as the original standard, operates in 5 GHz band, and uses a 52-subcarrier orthogonal frequency-division multiplexing (OFDM) with a maximum raw data rate of 54 Mbit/s, which yields realistic net achievable throughput in the mid-20 Mbit/s. The data rate is reduced to 48, 36, 24, 18, 12, 9 then 6 ...
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