Principle and application of WIFI technology
The full name of WiFi is WirelessFidelity. The biggest advantage of WiFi is its high transmission speed, which can reach 54Mbps. In addition, its effective distance is also very long. Its main characteristics are: fast speed, high reliability. In open areas, the communication distance can reach 305 meters; In a closed area, the communication distance is 76m to 122m, which is convenient to integrate with the existing wired Ethernet network. The cost of networking is lower. The outstanding advantages of Wi Fi technology are:
First, the radio wave covers a wide area, and the radius of WiFi can reach 100 meters. The office can be used even in the whole building, needless to say.
Second, the transmission speed is very fast, which can reach 11mbps, meeting the needs of personal and social informatization.
Compared with wired network, it has the following advantages:
1、 No wiring required
The main advantage of WiFi is that it does not need wiring and can not be restricted by wiring conditions, so it is very suitable for the needs of mobile office users and has broad market prospects;
2、 Health and safety
wireless network The way of use is not like the direct contact of mobile phone with human body, which has little impact on human health;
3、 Easy to set up network
Generally, the basic equipment for setting up a wireless network is a wireless network card and an AP, so that the network resources can be shared in a wireless mode with the existing wired architecture. The cost of setting up a wireless network and the complex procedures are far lower than the traditional wired network. If it is only a peer-to-peer network of several computers, AP is not required, and only wireless network cards are required for each computer. AP is the abbreviation of AccessPoint, which is generally translated as "wireless access node" or "bridge". It mainly acts as a bridge between wireless workstation and wired LAN in MAC of media access control layer. With AP, just like the hub of the general wired network, the wireless workstation can be quickly and easily connected to the network. Especially for the use of broadband, WiFi has more advantages. After the wired broadband network (ADSL, cell LAN, etc.) arrives at the home, it can be connected to an AP, and then a wireless network card can be installed in the computer. It is enough for an ordinary family to have an AP. Even after the user's neighbors are authorized, they can access the Internet in a shared way without adding ports.
4、 Long distance operation
Despite the small working distance of wireless WiFi, 802.11b's real working distance can reach more than 100 meters in the case of complete network construction, and the problem of data error correction and bit error in high-speed mobile has been solved. The handover and security authentication between WiFi devices, devices and base stations have been well solved.
In a word, the demand of home and small office network users for mobile connection is the driving force for the growth of WLAN market.
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