Bluetooth symbol length



  • Hi,
    I am now doing a project that use a sdr to capture the Bluetooth signal from the Lopy4. I want to know if this board transmits an empty packet in the advertisement channel when I use the function:

    BT = Bluetooth()
    BT.set_advertisement()
    BT.advertise(True)
    

    And if it is the case, can I consider that the packet duration will become 44us as defined in the specification.
    a080e1ba-f50b-4edc-b131-2c6de5dce032-image.png

    Besides, I also want to ask questions about symbols in Bluetooth. The specification says in Bluetooth 1E, the packet is transmitted 1M symbols /s and the preamble of the packet is 01010101(8 bits in total), does that mean if my sample rate is 10M samples /s, every 1 symbol transmitted corresponds to 10 samples I sampled.

    4236606a-4983-43e0-b0d5-f3a4a5d61ac4-image.png
    Thanks for your time



  • In addition, I am not sure what is the samples per symbol of the Bluetooth signal in Lopy4. I noticed that I can change this value when I use matlab example to generate Bluetooth signal.
    2efe3a78-ffe6-4808-be1d-29d2a7c6e72c-image.png


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