pwkits.org

Bluetooth technology for cellular phones is a form of short-range wireless communication device that allows two electronic devices to work without cables and wires. This means that you are able to have a cell phone conversation by way of a headset, or you can use a mouse for your smart phone, without having to hook these additional devices up with wires. All of the devices work through the same core system – the Bluetooth technology.

Bluetooth works using a physical layer referred to as the Bluetooth RF transceiver. This operates within the unlicensed ISM band which is centered at 2.4 gigahertz. Two point four gigahertz is the same range of frequencies which are utilized by Wi-Fi and microwaves). The very foundation of the system utilizes a transceiver which is capable of hopping frequencies in order to prevent fading and interference.

RF topology – also known as start topology – is used within all Bluetooth devices. When a group of such devices are synchronized together, the grouping is referred to as a piconet, which includes a master device and up to seven active slave devices. Further slaves may also be included, though they cannot also be actively participating in that network. However, one device may be applied in more than one piconet and can be either a master or a slave.

Within piconets, the actual radio channel that is used is shared among the synchronized devices in the group and are set to a common clock as well as a common pattern for frequency hopping. It is the master device that sets the pattern for the synchronization.

For example, when the master device is the cellular phone, all of the other devices within that phone’s piconet are referred to as the slaves. These slaves may be GPS receivers, an MP3 player, a headset, a car stereo, or any of the many other forms of Bluetooth enabled devices currently available. The master device – your cell phone – then sets the frequency hopping patterns for all of that piconet’s devices.

Naturally, it is quite a bit more complicated than this, and with the added securities that are becoming necessary, the algorithms for Bluetooth technology will only become more complex over time. However, it will ensure that our music, headsets, and other wireless devices continue to work just as we want them to.