26-02-2013, 02:52 PM
WIRELESS NETWORKS
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ABSTRACT
Now a days, wireless networks plays a very important role in our society. Wireless network refers to any type of computer network that is wireless, and is commonly associated with a telecommunications network whose interconnections between nodes is implemented without the use of wires. Wireless telecommunications networks are generally implemented with some type of remote information transmission system that uses electromagnetic waves, such as radio waves, for the carrier and this implementation usually takes place at the physical level or "layer" of the network.with the help of these wireless networks We can have the convinience .
We can have the economical freedom.Here the problem tracing is also very easy as we have no physical relation in between the systems.Now in these days we can have the wireless technology in the mobiles very much.in olden days we can have the communication through the long wires.If any connection is in failure then communication is not possible.But now it’s not at all a problem.We can easily have the networking between the cells.We can also have the wireless technology developped in between the systems.
Here the bluetooth technology is used now a days very frequently and through the wireless network bluetooth technology can be possible very easily .
1. INTRODUCTION:
The idea that resulted in the Bluetooth technology was born in 1994. Ericsson Mobile communications initiated a study to investigate the feasibility of a low-power, low-cost radio interface between Mobile Phones
And their accessories. The aim was to eliminate cables between Mobile Phones and PC cards, headsets and Desktop devices etc.
In February 1998, five companies, Ericssion, Nokia, IBM, Toshiba and Intel formed a Special Interest Group (SIG). The group contained the Mix of business areas –two market leaders in Mobile Telephony, to market leaders in Laptop computing and a market leader in core digital – signal-processor technology. It’s important to surround yourself with the right kind of people. That is a fact that even old Herald knew.
In this Electronic era, the devices used by us are rapidly growing. We are using several wires to supply power, to connect user interfaces, to connect each other. There will be no problem until we shift them from one place to another. Bluetooth wireless technology – the technology that propels you into a new dimension in wireless connectivity.
Why the name Bluetooth is given to this technology? The Answer is “Herald Bluetooth was the 10 th century Viking King who gave name to our technology. Herald Bluetooth was king of Denmark in the 10th century. He unified Denmark and part of Norway into a single kingdom, and then introduced Christianity into Denmark. But he was killed in 986 during battle with his son. So his name was choosen for this technology
2. NEED FOR BLUETOOTH:
There are already a couple of ways to get around wires. They are
1. Beams of light in the infrared spectrum.
2. Cable synchronization.
INFRARED:
It is used to connect some computers with peripheral devices. For most of these computer and entertainment purposes, infrared is used in a digital mode. The signal is pulsed on and off very quickly to send data from one point to another. Infrared communication are fairly reliable and don’t cost very much to build into a device. Reliable means interference between devices is uncommon because infrared transmitters and receivers have to be lined up with each other and we can make sure a message goes only to intended recipient, even in a room full of infrared receivers.
Drawbacks with infrared communications are
1. Infrared is a “line of sight “technology. For example we have to point the remote control at the TELEVISION or DVD player to make things happen.
2. Infrared is a “One –To –One” technology. For example we can send data from our PC to out LAPTOP, but not to both LAPTOP and PDA at the same time.
CABLE SYNCHRONIZATION:
In synchronization, we attach PDA to out computer (usually with a cable),
Press a button and make sure that the data on PDA and the data on the computer match. Its technique that makes the PDA a valuable tool for many people but synchronizing the PDA with the PC and making sure we have the correct cable or cradle to connect these two can be real hassle.
Bluetooth intended to get around the problems that come with both Infrared and Cable synchronizing system.