Bluetooth is an open standard that has been embraced by over 1,000 manufacturers of electronic appliances. It was named after the king Harald Bluetooth, the 10th century Viking who united Denmark and Norway.
- It provides an ad-hoc approach for enabling various devices to communicate within a nominal 10 meter range.
- Bluetooth operates in the 2.4 Ghz ISM band(2400-2483.5 MHz)
- It uses a frequency hopping TDD scheme
- Each Bluetooth channel has a 1 MHz bandwidth and hops at rate of approximately 1600 hops per second.
- Transmissions are performed in 625 microsecond slots with a single packet transmitted over a single slot.
- For long data transmissions particular users may occupy multiple slots using same transmission frequency.
Figure 5.13 Example of PAN as provided by bluetooth
The standard is designed to support operation in very high interference levels and relies on a number of forward error control (FEC) coding and automatic repeat request (ARQ) .
- It support a bit error rate (BER) of about 10-3.
IEEE 805.12 standard committee has been formed to provide an international forum for developing Bluetooth and other PANs.
- Advantages :
- Bluetooth is very affordable.
- Bluetooth is fully automated
- Highly Compatible
- Low power consumption.
- Sharing voice and information
- Personal Network
- It uses the same frequency as the Wavelan standard.
- Since Bluetooth is Omni-directional, it encounters problems in discovering the intended recipient device.