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Bluetooth Technology

The Air Interface & Frequency Band

The Bluetooth air interface is based on a nominal antenna power of 0dBm. The air interface complies with the FCC rules for the ISM band at power levels up to 0dBm. Spectrum spreading has been added to facilitate optional operation at power levels up to 100 mW worldwide. Spectrum spreading is accomplished by frequency hopping in 79 hops displaced by 1 MHz, starting at 2.402 GHz and stopping at 2.480 GHz. Due to local regulations the bandwidth is reduced in Japan, France and Spain. An internal software switch handles this. The maximum frequency hopping rate is 1600 hops/s. The nominal link range is 10 centimeters to 10 meters, but can be extended to more than 100 meters by increasing the transmit power. The Modulation is GFSK (Gaussian Frequency Shift Keying) with a BT=0.5. The Modulation index must be between 0.28 and 0.35. A binary one is represented by a positive frequency deviation, and a binary zero is represented by a negative frequency deviation. The symbol timing shall be better than 20 ppm.

-> Frequency bands in different countries. Bluetooth SIG is working towards harmonization of frequencies

More Information on Bluetooth

Bluetooth Index Page  |  What Is Bluetooth?  |  How It Works
 
Air Interface & Frequency Band  Applications  |  Technology Status Products & Vendors 
   Competing Technologies  | 
Market Outlook  |  Specifications  |  FAQ  | Resources

 


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