bluetooth

Technical Operation of Bluetooth

Bluetooth is a high speed, low powered wireless link technology that’s designed to connect phone or other portable equipment together with little to no work required by the user.  Unlike infrared, Bluetooth doesn’t require line of sites positioning to work. Current prototype circuit are contained on a board that is 0.9 cm square, with a much smaller circuit board develope.

bluetoothWhen one Bluetooth device come in contact with another, they will automatically exchange address and detail of capability.  Then, they can establish arround 1 MB link with security that they will use as required.  The protocol involved with handle both data and voice, with a very flexible topography.

The technology achieve its goal by embedding tiny, non expensive short range tranceiver into the device available today.  The radio operate on the 2.45 GHz frequency band, and support up to 721 KBps, along with three voice channels.

Each device offer a unique 48 bit address from the IEEE 802 standard, with the connection being point to point. The max range is 10 meters, while it can be extended to 100 meters by increasing the power.  The device is also protected from radio interference by changing their frequency, also known as frequency hopping.

What’s important, is the fact that Bluetooth device won’t drain battery life.  The specification target power consumption of the device, limiting the drain on battery.  The radio chip will consume only 0.3mA in stand by mode, which is less than 5% of the power that standard phone use.

Bluetooth will also guarantee security at the bit level.  The authentification is controlled by the user via a 128 bit key.  The radio signal can be coded with anything up to 128 bit.  With the frequency hopping, Bluetooth is already very hard to listen.

The baseband protocol is a combination of both circuit and packet switch.  Slot can be reserved for synchronous packet as well.  Each packet will be transmitted in a different hop frequency.Normally, a packet cover a single slot although it can be extended to cover up to five slot.

Bluetooth can also support data channel of up to three simultaneous voice channel.  Therefore, it’s possible to transfer the data while you talk at the same time.  Each individual voice channel will be support 64 KB.

From a technical standpoint, Bluetooth is very different.  It’s the best wireless method in the world, surpassing from infrared.  For communication on the go, Bluetooth is indeed very hard to compete with.

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