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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.
frequency (GHz) (Wi-Fi 0*) 802.11: 1997 1–2 2.4 (Wi-Fi 1*) 802.11b: 1999 1–11 2.4 (Wi-Fi 2*) 802.11a: 1999 6–54 5 (Wi-Fi 3*) 802.11g: 2003 2.4 Wi-Fi 4: 802.11n: 2009 6.5–600 2.4, 5 Wi-Fi 5: 802.11ac: 2013 6.5–6933 5 [a] Wi-Fi 6: 802.11ax: 2021 0.4–9608 [1] 2.4, 5 Wi-Fi 6E: 2.4, 5, 6 [b] Wi-Fi 7: 802.11be: 2024 [c] 0.4– 23,059: 2.4 ...
This is an advantage over the 2.4-GHz, ISM-frequency band, which offers only three non-overlapping, 20-MHz-wide channels where other adjacent channels overlap (see: list of WLAN channels). Better or worse performance with higher or lower frequencies (channels) may be realized, depending on the environment. 802.11n and 802.11ax can use either ...
For wider area communications, wireless local area network (WLAN) is used. WLANs are often known by their commercial product name Wi-Fi. These systems are used to provide wireless access to other systems on the local network such as other computers, shared printers, and other such devices or even the internet.
Resource Unit (RU) is a unit in OFDMA terminology used in 802.11ax WLAN to denote a group of 78.125 kHz bandwidth subcarriers (tones) used in both DownLink (DL) and UpLink (UL) transmissions. With OFDMA, different transmit powers may be applied to different RUs.
[11] [12] [13] It has built upon 802.11ax, focusing on WLAN indoor and outdoor operation with stationary and pedestrian speeds in the 2.4, 5, and 6 GHz frequency bands. [ 14 ] Throughput is believed to reach a theoretical maximum of 46 Gbit/s, although actual results are much lower.
The Unlicensed National Information Infrastructure (U-NII) [1] [2] radio band, as defined by the United States Federal Communications Commission, is part of the radio frequency spectrum used by WLAN devices and by many wireless ISPs.
IEEE 802.11ad (also referred to by its subject directional multi-gigabit, i.e., DMG) [1] is an amendment to the IEEE 802.11 wireless networking standard, developed to provide a Multiple Gigabit Wireless System (MGWS) standard in the 60 GHz band, and is a networking standard for WiGig networks.
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