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Bluetooth : The concept, working and utiility

|February 25 2011 |


By now blue-tooth is a known entity. We all possess mobile handsets with blue-tooth. We all it is a technology that helps in transferring and receiving data. But what exactly happens during the data transfer? How does this technology work? What are the technical configurations involved? Almost all of us would be wiser with this knowledge. Now, the technical details of Bluetooth´s function are very complex, and are best studied in detail in the PDF-format documents that can be found on the Bluetooth website.But specifically speaking the basic working of bluetooth is easy to understand. One of the first features of BT that need wisdom on is the fact that it operates on a frequency of 2.45Ghz  which has been set aside by international agreement for the use of industrial, scientific and medical devices (ISM)

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The BT devices in a mobile phone come in small micro chips. The basic functionality of a BT hinges on the setting up of small networks called PICONETS. One piconet can host upto 7 or 8 devices. The principle of BT is that while a transfer/connection is in progress, one of the devices has to be a MASTER and the rest are slaves. the master transfers data to the SLAVES. When a user wants to transmit data to a BT enabled device, first the BT is powered on. Now the sender's device starts a Query routine, where by it searches a radius of under 30 feet for possible BT enabled handsets. Once a partner device is located and a transfer instruction is sent, the sender becomes the MASTER and the receiver becomes the SLAVE. The data from the sender is sent in the frequency band of 2.4Ghz at speeds depending on the version of the BT in use. the most basic version 1.2 has a trasfer speed of 1 Mb/s. The networks are tiny in sie and hence the transfer speed which looks less is a lot better in practice.

Originally Gaussian frequency Keying (GFSK) modulation was the only modulation scheme available; subsequently, since the introduction of Bluetooth 2.0+EDR, ?/4-DQPSK and 8DPSK modulation may also be used between compatible devices. Such modulation help in achieving faster data rates. In one Piconet a master can communicate with as many as 7 other devices(slaves) and all these slaves are auto synchronized with the master's clock. Typically at any given time, data can be transferred between the master and one other device (except for the little-used broadcast mode). Also the devices can switch roles, by agreement, and the slave can become the master at any time.

The main advantages of blue tooth are
1. It provides cost effective data transfer
2. Data transfer through Bluetooth is very secure as there is practically no chance for cross talk or interference.
3. The speed of data transfer is high
4. The power consumed for a transfer is very little.
5. Apart from all these BTs can also act as antennas for internet connections.

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All in all the Bluetooth is a major force. To many readers the contents if this post maybe old, known or nothing new which is basically owing to the tremendous utility explosion of bluetooth. But then this post is targeted at users who are still in the dark on its functionality and i hope to them at least this provided a little insight. There is a lot more to bluetooth  than has been discussed here, check the following links for in depth wisdom

http://electronics.howstuffworks.com/bluetooth.htm



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