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“Bluetooth” is a de facto short-range
wireless communications standard operating in the unlicensed
2.4 GHz ISM(Industrial, Scientific, Medical) band that enables
voice and data transmissions in electronic and telecommunication
devices such as mobile phones, desktops, laptops, printers,
scanners, headsets etc. by means of small, low-cost, low-power
transceivers.
One of the key requirements in the design of the air-interface
is that it should be able to operate worldwide. The only frequency
band that satisfies these requirements is at 2.4 GHz ISM band.
The ISM band is also license free and open to any radio system.
To avoid interference from other signals
operating in the ISM frequency band, the Bluetooth wireless
technology uses a technique known as frequency hop spread
spectrum to make the link robust where the radio transceiver
hops to a different frequency after each transmission and
reception.
Also, it provides security via data encryption.
A number of mechanisms are used to provide security for Bluetooth
given its short-range nature and use in a global environment.
Authentication prevents spoofing and unwanted access to critical
data. For example, connecting a laptop to a cellular phone
may require a PIN to be entered. Encryption prevents eavesdropping
and maintains link privacy.
The data transmission rate, although variable
according to user environment, is about 300~700kbps.
Bluetooth has unlimited applications
as it can be applied to any electronic device. Bluetooth can
be electronic devices such as mobile phone, headset, car hands-free
kit, PC, LAN access point, printer, mouse, keyboard and joystick,
not to mention household appliances and office equipments.
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