Wi-Fi is a technology that can wirelessly connect terminals such as personal computers and handheld devices (such as PADs and mobile phones). Wi-Fi is a brand of wireless network communication technology, which is owned by the Wi-Fi Alliance. The purpose is to improve the interoperability between wireless network products based on IEEE 802. 1 1 standard. The LAN using IEEE 802. 1 1 series protocols is called Wi-Fi. Even equate Wi-Fi with wireless Internet (Wi-Fi is a large part of wireless local area network). [2]
Wi-Fi was originally the abbreviation of wireless fidelity. Wi-Fi is called wireless fidelity in English, which refers to the "wireless compatibility certification" in the wireless Landy category. It is essentially a business authentication and a wireless network technology. In the past, computers were connected by network cables, while 20 10 was connected by radio waves. Wireless router is common, so within the effective range of radio wave coverage of this wireless router, Wi-Fi connection can be used for networking. If a wireless router is connected to an ADSL line or other Internet access line, it is also called a "hotspot".
Wi-Fi Internet access can be simply understood as wireless Internet access. 20 10 Many smartphones and most tablets support Wi-Fi access. Wi-Fi, the full name of Wi-Fi, is the most widely used wireless network transmission technology. In fact, it is to convert wired network signals into wireless signals, as introduced at the beginning, using wireless routers to receive related computers, mobile phones, tablets and so on that support its technology. If the mobile phone has Wi-Fi function, it can surf the Internet without using the mobile Unicom network when there is Wi-Fi wireless signal, thus saving the traffic fee. But Wi-Fi signals are also provided by wired networks, such as ADSL at home and broadband at home. Wired signals can be converted into Wi-Fi signals as long as a wireless router is connected. Many cities in foreign developed countries have covered Wi-Fi signals provided by the government or large companies for residents to use, but this technology has not been popularized in China in 20 10.
So Wi-Fi access is still very easy to achieve at present. As long as we replace our traditional router with a wireless router, we can enjoy the Wi-Fi wireless network with simple setup. Generally, the receiving radius of Wi-Fi signal is about 95 meters, but it will be affected by walls. And the actual distance will be smaller, but it goes without saying that the office can also be used for the whole building because the distance is not very far.
Wi-Fi is widely used in 20 10 big cities. Although the wireless communication quality transmitted by Wi-Fi technology is not very good, the data security performance is worse than that of Bluetooth, and the transmission quality needs to be improved, but the transmission speed is very fast, reaching 54mbps, which meets the needs of personal and social informatization. The main advantage of Wi-Fi is that it does not need wiring and is not limited by wiring conditions, which is very suitable for the needs of mobile office users. Moreover, because the transmitted signal power is lower than 100mw, which is lower than the transmitted power of mobile phones, Wi-Fi surfing the Internet is relatively the safest and healthiest.
Historical Wi-Fi is a wireless network technology defined by IEEE. When IEEE formally defined the standard of 802. 1 1 in 1999, IEEE selected and recognized the wireless network technology invented by CSIRO as the best wireless network technology in the world, so the wireless network technology standard of CSIRO became the core technology standard of Wi-Fi in 20 10.
Wi-Fi technology was invented by CSIRO, a research institute under the Australian government, in the 1990s, and successfully applied for the wireless network technology patent in the United States on 1996. (U.S. Patent No.5,487,069) [3]
The inventor is a research team led by Dr. john O'Sullivan, an engineering graduate from the University of Sydney.
IEEE once asked the Australian government to give up the Wi-Fi patent and let the world use Wi-Fi technology for free, but it was rejected. [4]
The Australian government subsequently won the lawsuit or settled out of court in the United States, suing almost all electrical and telecommunications companies in the world (including Apple, Intel, Lenovo, Dell, AT & amp； T, Sony, Toshiba, Microsoft, Acer, ASUS, etc. ) 20 10/0 Every time we buy an electronic device with Wi-Fi technology, the price paid includes the patent fee paid to the Australian government. [5-6]
In 20 10, it is estimated that there will be 3 billion electronic devices using Wi-Fi technology every day in the world, and by the end of 20 13, that is, after the expiration of CSIRO's wireless network patent, this number is expected to increase to 5 billion.
Wi-Fi has been praised by the Australian media as the most important scientific and technological invention in Australian history, and its inventor, John O'Sullivan, has been called "the father of Wi-Fi" by the Australian media, and has won the highest national science award in Australia [7] and many praises from all over the world, including the European Inventor Award 20 12, namely 2065432, awarded by the European Union, the European Patent Office and the European Patent Office (EPO).