23-09-2014, 02:27 PM
WI-FI TECHNOLOGY
[attachment=68381]
ABSTRACT:
Technology is making rapid progress and is making many things easier.As the innovative thinking of persons is increasing day-by-day,new methods for wireless networking has been evolved of which our present topic Wi-Fi is the most accepted technology.
Wi-Fi, an acronym for Wireless-Fidelity which is the wireless way to handle networking.The main aim of this paper is wireless networking achieved by Wi-Fi.This paper introduces Wi-Fi technology and states the history of this technology in brief.We then deal with the different ways of wireless networking,connecting wi-fi and with wi-fi security.This paper concludes with the pros and cons of this technology and it’s future.
2.Introduction:
Wi-Fi, an acronym for "Wireless Fidelity", is a set of product compatibility standards for Wireless Local Area Networks (WLAN) based on the IEEE 802.11 specifications. Wi-Fi was intended to be used for mobile devices and LANs, but is now often used for Internet access. It enables a person with a wireless-enabled computer or personal digital assistant (PDA) to connect to the Internet when in proximity of an access point.
Wireless Fidelity is the wireless way to handle networking. It is also known as 802.11 networking and wireless networking. Using this technology we can connect computers anywhere in a home or office without the need of any wires. The computers connect to the network using radio signals, and they can be up to 100 feet or so apart.
Wi-Fi allows to connect to the internet from virtually anywhere at speeds of up to 54Mbps.The computers and handsets enabled with this technology use radio technologies based on the IEEE 802.11 standard to send and receive data anywhere within the range of a base station.
Wi-Fi goes beyond wirelessly connecting computers, it also connects people.
Wi-Fi's Radio Technology:
The radios used in Wi-Fi are not so different from the radios used in walkie-talkies. There are three big differences between Wi-Fi radios and Walkie-talkies.
• WiFi radios that work with the 802.11b and 802.11g standards transmit at 2.4 GHz, while those that comply with the 802.11a standard transmit at 5 GHz. Normal walkie-talkies normally operate at 49 MHz. The higher frequency allows higher data rates.
• WiFi radios use much more efficient coding techniques that also contribute to the much higher data rates. For 802.11a and 802.11g, the technique is known as orthogonal frequency-division multiplexing (OFDM). For 802.11b, it is called Complementary Code Keying (CCK).
• The radios used for WiFi have the ability to change frequencies. 802.11b cards can transmit directly on any of three bands, or they can split the available radio bandwidth into dozens of channels and frequency hop rapidly between them. The advantage of frequency hopping is that it is much more immune to interference and can allow dozens of WiFi cards to talk simultaneously without interfering with each other.
Configuring WiFi:
On the newest machines, an 802.11 card will automatically connect with an 802.11 hotspot and a network connection will be established. As soon as we turn on our machine, it will connect and we will be able to browse the web, send email, etc using Wi-Fi. On older machines we often have to go through this simple 3-step process to connect to a hotspot:
• Access the software for the 802.11 card- normally there is an icon for the card down in the system tray at the bottom right of the screen.
• Click the "Search button" in the software. The card will search for all of the available hotspots in the area and shows a list.
• Double-click on one of the hotspots to connect to it.
• On ancient 802.11 equipment, there is no automatic search feature. We have to find what is known as the SSID (server set id) of the hotspot (usually a short word of 10 characters or less) as well as the channel number (an integer between 1 and 11) and type these two pieces of information in manually. All the search feature is doing is grabbing these two pieces of information from the radio signals generated by the hotspot and displaying them for us.
Advantages of Wi-Fi:
1. Wi-Fi is a core technology in GPS Industries Applications.
2. Wi-Fi technology available in hotels, airports, etc., will be more inclined to bring laptop with us when traveling for personal reasons.
3. Frees network devices from cables, allows for a more dynamic network to be grown.
Changes the way people live, communicate, work and play.
4. Many reliable and bug-free Wi-Fi products on the market
5.It helps to become more productive at home, like online shopping and banking;
6. Wi-Fi technology allows getting out of home office and working in other rooms.
8.Disadvantages of Wi-Fi:
1.The 802.11b and 802.11g flavors of Wi-Fi use the 2.4 GHz spectrum, which is crowded with other devices such as Bluetooth, microwave ovens, cordless phones, or video sender devices, among many others.
2.Power consumption is fairly high compared to other standards, making battery life and heat a concern.
3.It is not always configured properly by users.
. Conclusion:
As Wi-Fi is now shipped in millions of products and deployed in millions of homes, business and hotspots worldwide, the technology has moved beyond the realm of a computer feature. Wi-Fi has fast become a cultural phenomenon
[attachment=68381]
ABSTRACT:
Technology is making rapid progress and is making many things easier.As the innovative thinking of persons is increasing day-by-day,new methods for wireless networking has been evolved of which our present topic Wi-Fi is the most accepted technology.
Wi-Fi, an acronym for Wireless-Fidelity which is the wireless way to handle networking.The main aim of this paper is wireless networking achieved by Wi-Fi.This paper introduces Wi-Fi technology and states the history of this technology in brief.We then deal with the different ways of wireless networking,connecting wi-fi and with wi-fi security.This paper concludes with the pros and cons of this technology and it’s future.
2.Introduction:
Wi-Fi, an acronym for "Wireless Fidelity", is a set of product compatibility standards for Wireless Local Area Networks (WLAN) based on the IEEE 802.11 specifications. Wi-Fi was intended to be used for mobile devices and LANs, but is now often used for Internet access. It enables a person with a wireless-enabled computer or personal digital assistant (PDA) to connect to the Internet when in proximity of an access point.
Wireless Fidelity is the wireless way to handle networking. It is also known as 802.11 networking and wireless networking. Using this technology we can connect computers anywhere in a home or office without the need of any wires. The computers connect to the network using radio signals, and they can be up to 100 feet or so apart.
Wi-Fi allows to connect to the internet from virtually anywhere at speeds of up to 54Mbps.The computers and handsets enabled with this technology use radio technologies based on the IEEE 802.11 standard to send and receive data anywhere within the range of a base station.
Wi-Fi goes beyond wirelessly connecting computers, it also connects people.
Wi-Fi's Radio Technology:
The radios used in Wi-Fi are not so different from the radios used in walkie-talkies. There are three big differences between Wi-Fi radios and Walkie-talkies.
• WiFi radios that work with the 802.11b and 802.11g standards transmit at 2.4 GHz, while those that comply with the 802.11a standard transmit at 5 GHz. Normal walkie-talkies normally operate at 49 MHz. The higher frequency allows higher data rates.
• WiFi radios use much more efficient coding techniques that also contribute to the much higher data rates. For 802.11a and 802.11g, the technique is known as orthogonal frequency-division multiplexing (OFDM). For 802.11b, it is called Complementary Code Keying (CCK).
• The radios used for WiFi have the ability to change frequencies. 802.11b cards can transmit directly on any of three bands, or they can split the available radio bandwidth into dozens of channels and frequency hop rapidly between them. The advantage of frequency hopping is that it is much more immune to interference and can allow dozens of WiFi cards to talk simultaneously without interfering with each other.
Configuring WiFi:
On the newest machines, an 802.11 card will automatically connect with an 802.11 hotspot and a network connection will be established. As soon as we turn on our machine, it will connect and we will be able to browse the web, send email, etc using Wi-Fi. On older machines we often have to go through this simple 3-step process to connect to a hotspot:
• Access the software for the 802.11 card- normally there is an icon for the card down in the system tray at the bottom right of the screen.
• Click the "Search button" in the software. The card will search for all of the available hotspots in the area and shows a list.
• Double-click on one of the hotspots to connect to it.
• On ancient 802.11 equipment, there is no automatic search feature. We have to find what is known as the SSID (server set id) of the hotspot (usually a short word of 10 characters or less) as well as the channel number (an integer between 1 and 11) and type these two pieces of information in manually. All the search feature is doing is grabbing these two pieces of information from the radio signals generated by the hotspot and displaying them for us.
Advantages of Wi-Fi:
1. Wi-Fi is a core technology in GPS Industries Applications.
2. Wi-Fi technology available in hotels, airports, etc., will be more inclined to bring laptop with us when traveling for personal reasons.
3. Frees network devices from cables, allows for a more dynamic network to be grown.
Changes the way people live, communicate, work and play.
4. Many reliable and bug-free Wi-Fi products on the market
5.It helps to become more productive at home, like online shopping and banking;
6. Wi-Fi technology allows getting out of home office and working in other rooms.
8.Disadvantages of Wi-Fi:
1.The 802.11b and 802.11g flavors of Wi-Fi use the 2.4 GHz spectrum, which is crowded with other devices such as Bluetooth, microwave ovens, cordless phones, or video sender devices, among many others.
2.Power consumption is fairly high compared to other standards, making battery life and heat a concern.
3.It is not always configured properly by users.
. Conclusion:
As Wi-Fi is now shipped in millions of products and deployed in millions of homes, business and hotspots worldwide, the technology has moved beyond the realm of a computer feature. Wi-Fi has fast become a cultural phenomenon