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WI-FI TECHNOLOGY: PRINCIPLES AND APPLICATIONS


Wi-Fi ( /ˈwaɪfaɪ/) or Wifi, is a mechanism for wirelessly connecting electronic devices. A device enabled with Wi-Fi, such as a personal computer, video game console, smartphone, tablet, or digital audio player, can connect to the Internet via a wireless network access point. An access point (or hotspot) has a range of about 20 meters (65 ft) indoors and a greater range outdoors. Multiple overlapping access points can cover large areas.continue..


In the beginning-Wi-Fi would certainly not exist without a decision taken in 1985 by the Federal Communications Commission (FCC), America's telecoms regulator, to open several bands of wireless spectrum, allowing them to be used without the need for a government licence. This was an unheard-of move at the time; other than the hamradio channels, there was very little unlicensed spectrum. But the FCC, prompted by a visionary engineer on its staff, Michael Marcus, took three chunks of spectrum from the industrial, scientific and medical bands and opened them up to communications entrepreneurs.continue..

If you've been in an airport, coffee shop, library or hotel recently, chances are you've been right in the middle of a wireless network. Many people also use wireless networking, also called WiFi or 802.11 networking, to connect their computers at home, and some cities are trying to use the technology to provide free or low-cost Internet access to residents. In the near future, wireless networking may become so widespread that you can access the Internet just about anywhere at any time, without using wires.continue..

Having the ability to connect to the internet anywhere we go is undoubtedly awesome, but it isn't the only gift Wi-Fi technology has given us. Here are our 10 favorite uses for Wi-Fi that go beyond accessing the web.
10. Turn Your Smartphone into a Remote Control Full size If all the computers in your house are connected to a Wi-Fi network, you can easily connect your smartphone to the same network and control them. With apps like.. continue..

There are many WiFi advantages to users. Let's have a closer look at them:
  • WiFi uses unlicensed radio spectrum and does not require regulatory approval for individual deployers.
  • It allows local area networks (LANs) to be setup with cabling. The can reduce associated costs of network connection and expansions. Places where cables cannot be run, such as outdoor areas and historical buildings can use wireless LANs.
  • WiFi products are extensively available in the market. There are different brands of access points and user's network interfaces are able to inter-operate at a very basic service level. continue..
Due the fact that WiFi are still relatively new, there are considerably more disadvantages to users. Let's have a look at them:
  • The use of WiFi band that is 2.4 GHz does not require a license in most countries provided that is stays below limit of 100mW and one accepts interference from other sources; including interference which causes the users devices to no longer function.
  • The spectrum assignments and operational limitations are not consistent worldwide.
  • Power consumption is fairly high compared to some other standards, making the battery life and heat a concern to some users. continue..

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