A large amount of data was conducted on the IEEE802.11 protocol in WiFi, and its historical development is summarized as follows. The following summary is not a comprehensive and detailed record, but rather describes the mainstream protocols currently used in the market.
IEEE 802.11, formulated in 1997, is an original standard (2Mbit/s, broadcast at 2.4GHz). Its rate is relatively slow and it laid the foundation for wireless protocols.
IEEE 802.11a was formulated in 1999. Its improvement lies in supplementing the physical layer (54Mbit/s, with a frequency band of 5GHz).
IEEE 802.11b, formulated in 1999, is a physical layer supplement to the 2.4GHZ proposed in 11 (11Mbit/s, broadcast at 2.4GHz).
IEEE 802.11g, 2003, Physical layer supplement (54Mbit/s, broadcast at 2.4GHz).
Under the IEEE 802.11n protocol, the transmission rate has been significantly improved. The base rate has been increased to 72.2Mbit/s, and with a double bandwidth of 40MHz, the rate has been raised to 150Mbit/s. Support Multi-Input Multi-Output (MIMO) technology. This agreement jointly improves the frequency band between 2.4GHZ and 5GHZ.
IEEE 802.11ac, a potential successor to 802.11n, offers improvements in higher transmission rates, increasing the wireless rate to at least 1Gbps when multiple base stations are used and the single-channel rate to at least 500Mbps. It uses higher wireless bandwidth (80 MHZ -160MHz, while 802.11n only has 40MHz), more MIMO streams (up to 8 streams), and better modulation methods (QAM256). The official standard was launched on February 18, 2012.
Among them, there is a rather special protocol. Besides the IEEE standard mentioned above, there is another technology called IEEE 802.11b+. A data transmission rate of 22Mbit/s is provided based on IEEE 802.11b (2.4GHz frequency band) through PBCC technology (Packet Binary Convolutional Code).
The above is the knowledge explanation of the “IEEE 802.11 Standard List” brought by Shenzhen HDV Phoelectron Technology Co., LTD. The communication products produced by this company cover:
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