Shulou(Shulou.com)06/01 Report--

Officially open a blog, leaving some of their own learning WLAN some gains.

First, what is WLAN?

WLAN is what we often hear as Wi-Fi, the abbreviation of Wireless Local area Network (Wireless Local Area Network). It is a local area network based on radio frequency wireless microwave communication technology.

Second, what are the standards of WLAN

Since WLAN is a radio frequency communication technology, it is inevitable that there will be some standards. Here are some WLAN standards that are often mentioned

IEEE 802.11 (original standard), or IEEE 802.11-1997 or IEEE 802.11-1999, is the original standard for 802.11 wireless networks. The standard was issued in 1997 and clarified in 1999. Most of this earlier version of the protocol is now rarely used.

802.11b, whose full name is IEEE 802.11b-1999, is a revision of the original physical layer of 802.11. 802.11b works on 2.4G channel, and the rate of physical layer is increased to 11Mbps. The specification has been widely used in the world. Related modifications have been integrated into IEEE 802.11-2007 as part of the 802.11 protocol.

802.11aJue IEEE 802.11a-1999, a revised standard of the 802.11 original standard, was approved in 1999. This standard adopts the same core protocol as the original standard, operates at 5GHz frequency, uses 52 orthogonal frequency division multiplexing subcarriers, and the maximum original data transmission rate is 54Mbps.

802.11g, IEEE 802.11g-2003 is a revision of the 802.11 original standard physical layer. The operating frequency is 2.4GHz, 52 orthogonal frequency division multiplexing subcarriers are used, and the maximum original data transmission rate is 54Mbpss.

802.11n IEEE 802.11n-2009, a revised specification for the IEEE 802.11-2007 WLAN standard. Its goal is to improve the shortcomings of the previous two wireless network standards, including 802.11a and 802.11g. Working frequency 2.4GHz or 5Ghz. Its maximum transmission speed is 600Mbps, which is much higher than the previous 54Mbps, and the transmission distance will also be increased.

IEEE 802.11-2013, revised version of 802.11-2009, operating in 5Ghz, with higher transmission speed, theoretical transmission speed 1.3Gbps (wave1)

Third, WLAN usage scenarios

At present, 802.11WLAN is more and more widely used, from notebook computers to mobile phones, televisions and more smart home appliances have begun to use 802.11WLAN access as a conventional access method. It is believed that 802.11WLAN technology will be used more and more widely in the future.

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