Bluetooth is a current industry standard for short-range wireless connectivity. Bluetooth technology is widely used in consumer electronics for short-range wireless data transfer, like printers and digital cameras. It operates efficiently within the range of 20-25 ft in the environment without WLAN equipments. Bluetooth signals operate in the same frequency range as WI-FI (802.11b, g) standard. This is the biggest disadvantage of it because of its interference with WI-FI signals. A Bluetooth enabled device is not being able to function efficiently in the vicinity of WI-FI signals. Bluetooth technology took many years to come into mass market but still is struggling to really prove its potentials. Bluetooth faces major challenges by upcoming Ultra-Wideband standard which has many advantages such as higher data-rate and capability to co-exist with other wireless standards.
How bluetooth got its name?? King Harald Gormsson, 10th Century Danish King, is famous for ruling Denmark and then Norway between about 940 and about 986, ultimately uniting all of Scandinavia. He also had a nickname: blátǫnn in Old Norse or Blåtand in Danish,which means Bluetooth. The history throws back to 1942, when Hedy Lamarr invents the basic technology on which Bluetooth is based to make communications between ships and torpedos immune to jamming. The Navy didn’t adopt it until the Cuban Missile crisis in 1962, long after her patent has expired. In 1994 Engineers at Ericsson, a Swedish communications company, invented the technology later called Bluetooth. It was intended as a wireless replacement for the ubiquitous wired data standard RS232C , which was used to connect many types of computer peripheral devices, printers and such over short distances usually 6 feet or less. It never fully realized that market as the cheaper USB cable replaced RS232c and now most computer peripherals connect via Wi-Fi. In 1998 Bluetooth SIG formed initially consisting of the Swedish company Ericsson, Intel, Nokia, Toshiba and IBM. It now has more than 24,000 members and is in 90% of all mobile phones (per SIG)1999 . Bluetooth 1.0 Released 2005, Bluetooth 2.0 with Enhanced Data Rate (EDR). Each subsequent release incorporates the compatible technologies of earlier releases.
Bluetooth Version 2 + EDR or Enhanced Data Rate uses a different method of modulation, it still uses GFSK header information (transmitter ID, packet type, packet length) but the data payload is encoded with a higher information content modulated 8 phase differential phase shift keying (8DPSK, 3bits/symbol) modulation to achieve a 3Mbps data rate. It also allows for a pi/4 Rotated differential quaternary phase shift keying (pi/4 DQPSK, 2 bits/symbol) to achieve a 2Mbps data rate.
Bluetooth technology uses radio waves, transmiting them over a shorter distance. Radios and TV broadcasts over many miles or kilometers. Bluetooth technology sends information within your Personal Area Network or “PAN” at distances up to 100 meters (328 feet)—depending upon device implementation. Bluetooth technology operates in the unlicensed industrial, scientific and medical (ISM) band at 2.4 to 2.485 GHz, using a spread spectrum, frequency hopping, full-duplex signal at a nominal rate of 1600 hops/sec.
Many people still have confusion regarding Wifi and bluetooth… Bluetooth is mainly used for linking computers and electronic devices in an ad-hoc way over very short distances, often for only brief or occasional communication using relatively small amounts of data. It’s relatively secure, uses little power, connects automatically, and in theory presents little or no health risk. Wi-Fi is designed to shuttle much larger amounts of data between computers and the Internet, often over much greater distances. It can involve more elaborate security and it generally uses much higher power, so arguably presents a slightly greater health risk if used for long periods. Bluetooth and Wi-Fi are complementary Technologies.
Bluetooth wireless technology is built into billions of products, from cars and mobile phones to medical devices and computers and even forks and toothbrushes. Bluetooth technology allows you to share voice, data, music, photos, videos and other information wirelessly between paired device.
Bluetooth Technology Applications include following and many more..:-
- Mobile Phones
- Remote Speakers (AC Powered)
- Computer Speakers (Battery Powered)
- Bluetooth Transmitter
- Home Theater