Bluetooth
How Bluetooth works
Bluetooth is a wireless technology that allows computers, phones and other devices to talk to each other over short distances (typically about 10 meters). Bluetooth uses low power radio waves (in the 2.4 Gigahertz range), and is designed to be a secure and inexpensive way of connecting and exchanging information between devices without wires.
This technology is used in many of the newer mobile phones, handheld computers, laptops, printers, handheld organisers, as well as in all sorts of products. It uses a common protocol, so transmission of data (and voice) between two Bluetooth devices from different manufacturers should be straightforward.
Uses of Bluetooth include:
- exchanging business cards
- sending data over a modem
- sending voice from a headset to a mobile phone
- real-time satellite navigation using GPS
The main benefits of Bluetooth
Bluetooth offers a number of benefits for data transfer data between devices including:-
- Cable-free, so less messy leads to worry about
- Bluetooth can connect up to eight devices simultaneously
- Interoperability - In most cases, you can use your portable Bluetooth device to connect with other existing Bluetooth devices quickly without any new software installs.
Bluetooth uses a technique called spread-spectrum frequency switching that makes it rare for more than one device to be transmitting on the same frequency at the same time. Using this approach, a device will use 79 individual, randomly chosen frequencies within a defined range, hopping from one to another on a regular basis. In the case of Bluetooth, the transmitters change frequencies 1,600 times every second, hence more devices can make full use of a limited slice of the radio spectrum.
Since every Bluetooth transmitter uses spread-spectrum transmissions automatically, there is only a remote possibility that two transmitters will be on the same frequency at the same time. In addition, this approach also minimises any interferences with other radio frequency using devices such as baby monitors, aircraft systems etc
The next Bluetooth update
Since it originally appeared commercially, Bluetooth has now progressed to Bluetooth 2.1 + EDR (Enhanced Data Rate) specification and has been adopted by the Bluetooth special interest group in 2007. The next version planned, Bluetooth 3.0 has new enhancements including plans to adopt ultra-wideband (UWB) radio technology. This will allow Bluetooth use over UWB radio, enabling very fast data transfers of up to 480 Mbit/s, while building on the very low-power idle modes of Bluetooth.
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