LUETOOTH TECHNOLOGY

ABSTRACT
Bluetooth technology unplugs our digital peripherals and makes a cable clutter a thing of the past. In short, it is a wireless replacement for many of the cables we currently use to transmit voice and data signals. It is the result of the joint achievements of nine leading companies: 3COM, Lucent Technologies, IBM, Intel, Microsoft, Motorola, Nokia, Toshiba, Ericsson, altogether known as the Blue Tooth Special Interest Group (SIG). The idea is to create a single wireless protocol to address the end-user problems arising from proliferation of various mobile devices.
The Bluetooth specification is ideal for mobile professionals who need to link notebook computers, mobile phones, PDA’s , PIMs, digital cameras, and other hand-held devices to do business at home, on the road, or in the office. Governments worldwide regulate it, so it is possible to utilize the same standard wherever one travels. Bluetooth provides three low power modes to conserve battery life: sniff mode, hold mode, and park mode. It aims at low power consumption and provides security for both stationary and mobile devices. A
Bluetooth chip (9mm x 9mm) takes the information normally carried by the cable, and transmits it at a special frequency to a receiver. Bluetooth radio modules use Gaussian Frequency Shift Keying (GFSK) for modulation. Blue Tooth employs an FHSS spreading technique, changing frequencies at a rate of 1600 times per second - 160 times the rate at which a wireless LAN changes frequencies. This provides a fairly robust communications link for its intended range. Signals can be transmitted through walls and briefcases, thus eliminating the need for line-of-sight.
Bluetooth is a standard developed that allows any sort of electronic equipment –from cellphones to keyboards and headphones-to make its own connections without direct action from a user.