If direct sequence spread spectrum techniques were used then other transmitters nearer to the receiver would block the required transmission if it is further away and weaker
BLUE TOOTH BANDWIDTH BLUETOOTH
The standard uses a hopping rate of 1600 hops per second, and the system hops over all the available frequencies using a pre-determined pseudo-random hop sequence based upon the Bluetooth address of the master node in the network.ĭuring the development of the Bluetooth standard it was decided to adopt the use of frequency hopping system rather than a direct sequence spread spectrum approach because it is able to operate over a greater dynamic range. A Bluetooth transmission only remains on a given frequency for a short time, and if any interference is present the data will be re-sent later when the signal has changed to a different channel which is likely to be clear of other interfering signals. With many other users on the ISM band from microwave ovens to Wi-Fi, the hopping carrier enables interference to be avoided by Bluetooth devices. It uses frequencies in the 2.4 GHz ISM band, and it uses a technique called frequency hopping where the signal moves from one frequency to the next at regular intervals. The Bluetooth radio interface utilises a number of techniques and signal formats to enable it to operate reliably. The Bluetooth wireless interface was designed to provide reliable performance even in the face of interference from other devices using the same frequencies.Īs other technologies including Wi-Fi and many other devices using the same frequencies, reliable operation is required, and the Bluetooth radio interface has been designed to provide this.
The Bluetooth radio interface provides a straightforward but very effective form of wireless connectivity. Bluetooth radio interface, modulation, & channels The Bluetooth radio interface uses techniques: modulation frequency hopping & protocols to ensure reliable & effective data transfer.īluetooth technology basics Radio interface File transfer Bluetooth profiles Pairing & networking Security
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