BLUETOOTH TECHONOLOGY

BLUETOOTH TECHONOLOGY

ABSTRACT:

The Bluetooth wireless technology was created to solve a simple problem: replace the cables used on mobile devices with radio frequency waves. The technology encompasses a simple low-cost, low-power, global radio system for integration into mobile devices. Such devices can form a quick ad-hoc secure "piconet" and communicate among the connected devices. This technology creates many useful mobile usage models because the connections can occur while mobile devices are being carried in pockets and briefcases

Bluetooth uses radio waves in 2.4GHz band. The main disadvantage of infrared communication i.e. requirement of ‘line of sight’, gets eliminated as radio waves are used for communication in Bluetooth. Bluetooth only operates at weak wattage levels. Bluetooth works in small confined area of 10 to 15 meters and it can also be increased upto 100 meters by increasing power. Bluetooth use a technology called spread spectrum frequency hopping. It gives security to the system in terms of interference problem. Bluetooth supports not only point-to-point connections but also multipoint connections. The multipoint connection of devices is called as piconet and network of many piconets form scatternet. Piconet is also called as PAN i.e. ‘Personal Area Network’.In this paper ww will discuss brief about working

Chipsets are very small in size and further smaller chips are in development, hence now a days Bluetooth technology has moved fast in terms of adoptation. So the ‘Special Interest Group’ of Bluetooth (SIG) introduced by Ericsson in 1994, has now tripled in size and has over 2000 companies on board.

INTRODUCTION:

WHAT IS BLUETOOTH?

"Think of a connected world of electronic devices and appliances around you! You click on an icon for a device and you are linked to it, automatically and transparently" .

A cable replacement standard has been defined because cables limit mobility of the consumer; they are cumbersome to carry around, are easily lost or broken. Often connectors are prone to difficult to diagnose failures; or are proprietary. To counteract these limitations Bluetooth is designed to be light and portable. It can be embedded to take the riggers of physical knocks and shocks. It includes standards and protocols to make it mobile, robust, reliable and not limited to one manufacturer.

The operating band also fits the goals of Bluetooth, imposing requirements as a cable replacement. The cost needs to be comparable with cable. Reductions can be achieved by operating in the licence free 2.4 GHz ISM band, keeping backward compatibility wherever possible lowers the cost of ownership by avoiding upgrades and having a relaxed radio specification enables single chip integrated circuit solutions. It also needs to be as reliable and resilient as cable and cope with errors and degradation caused by interference. For mobile devices it must be compact, lightweight, low power and easy to use.
Briefly, Bluetooth technology

Evolved from basic cellular digital radio designs implemented in mobile phones since the early 1980s.
Based on 802.11 in ad-hoc mode
Short range (up to 10m) radio communications standard
Runs at 2.4 GHz, near microwave frequency Unlicensed part of spectrum
No line of sight is required
Performs fast frequency hopping (1600 hops/sec) between 79 points to avoid interference
Is full duplex
Low power, 30-100mA during sustained data transmissions
Devices automatically switch to power saving mode
Bandwidth is wide enough to carry voice & data
an asynchronous data channel, or
up to 3 simultaneous synchronous voice channels, or
a channel which simultaneously supports asynchronous data and synchronous voice.
Transfers data at 721 Kbps
three to eight times the average speed of parallel and serial ports, respectively.
Up to 7 simultaneous connections can be established and maintained


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