Bluetooth Note

1)Four physical channels

  a)the basic piconet channel    : used for communication between connected devices

  b)the adapted piconet channel  : used for associated with a specific piconet.

  c)the inquiry scan channel     : used for discovering bluetooth device

  d)the page scan channel        : used for connecting bluetooth device

  

2)The frequency hopping in the piconet physical channel is determined by 

  

  a)Bluetooth clock

  b)BD_ADDR of the master.

 

3)For Bluetooth ,two modulation modes are defined.

 

 a)A mandatory mode,called Basic Rate          (FM modulation)    1Mbps

 b)An optional mode,called Enhanced Data Rate. (PSK modulation)   pi/4-DQPSK : 2Mbps 8DPSK:3Mbps

 

4)Bluetooth Frequency Bands

  2.400  ~ 2.4835GHZ    f = 2402 + k MHZ, k=0,,78

  

  lower guard band 2MHZ

  upper guard band 3.5MHZ

  

5)The Bluetooth device is classified into three power classes

  a)Class 1  :  1mW(0dBm)      ~  100mW(20dBm) 

  b)Class 2  :  0.25mW(-6dBm)  ~  2.5mW(4dBm)

  c)Class 3  :  N/A            ~  1mW(0dBm)