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WiFi and Bluetooth coexistence

Vasco Tesi
Intellectual 590 points
Other Parts Discussed in Thread: CC2540

Hi all, this is a  quite philosophical question, but 'im posting in this forum because i'm collecting informations looking forward to a Bluetooth Low Energy application using TI's SoC. 

I've found an interesting paper here , but it misses an important parameter : the  Bluetooth devices class w.r.t. TX power . They were class 1, 2, or 3 ?

And the output power of WiFi devices was +17 dBm? 

without this information, the usefulness of the report is rather low.. 

  • 0
    Guru 18595 points

    Hi Vasco,

    Max for 802.11 is +20dBm, I think. Most devices do not reach this value. For example, my Atheros WLAN only reaches +18dBm under Linux.

    BLE devices have no concepts such as power classes in traditional Bluetooth. CC2540 for example can be programmed for -4dBm, 0dBm and +6dBm (or something very similar to this) but no power classes at all. I think max in BLE is +10dBm, which may be achieved with other manufacturers' motes.

    Traditional Bluetooth has AFH (Adaptive Frequency Hopping) but I think BLE does not incorporate it. Even so, some precautions have been taken, like placing ADV channels just in the less frequented 802.11 channels.

  • 0 in reply to kazola
    Intellectual 590 points

    Hi Kazola, thank you for your reply. 

    802.11 transmitters have generally trasmitted power limited to a value lower than +20 dBm, in order to accomodate for antenna gain (a dipole , for example , has about 2 dB of gain). 

    I agree with your considerations about differences between BT and BTLE, but i'd like to know BT device class in the referred document in order to understand which will be the behavior with BTLE & WiFi in the same area , taking into account the differences between BT and BTLE.