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nRF54L15 QFN Bluetooth Channel Sounding TX power and external FEM/LNA

Robert Brovdie

Hello Nordic team,

I am using the nRF54L15 QFN with Bluetooth Channel Sounding.

Channel Sounding is already working in my application and is useful for warehouse object positioning, but the practical range is currently too short.

My questions:

1. Does Bluetooth Channel Sounding on the nRF54L15 currently support an external FEM/LNA/power amplifier?

2. Is FEM/LNA support planned for a future NCS release?

3. Is Nordic planning any Bluetooth Channel Sounding device with higher TX power than the nRF54L15 QFN?

4. What is the officially recommended way to increase Channel Sounding range at this time?

Best regards,

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  • 0

    Hi,

    What ranges are you having an issue reaching? And are you able to get the connection, just no reasonable results? 

    My understanding is that if you want really high ranges, then it is also "considered CS" if you just use the Bluetooth LE round-trip timing, which means that you are just limited by the BLE range, which can be rather high (although maybe not in a warehouse setting). 

    I should also say that CS, much like direction finding, is limited by the algorithm you are using to interpret the i/q values. What we offer is a good way to get these I/q values. We also offer an algorithm that does an ok job at processing them, though for the best performance, I would definitely hope that you contact a third party that provides good algorithms for processing them - we do not claim to be the best at that part.

    1. Does Bluetooth Channel Sounding on the nRF54L15 currently support an external FEM/LNA/power amplifier?

    2. Is FEM/LNA support planned for a future NCS release?

    I can't comment on future plans, for that you would have to talk to your regional sales manager. Ask me if you would like his/her contact details.

    But my understanding is that since CS is a very time sensitive thing, using a FEM wouldn't work. And that is a theoretical limitation; I am not sure how you would make that work with an update to NCS in the future. This also excludes coded phy.

    3. Is Nordic planning any Bluetooth Channel Sounding device with higher TX power than the nRF54L15 QFN?

    I can't comment on future plans. 

    4. What is the officially recommended way to increase Channel Sounding range at this time?

    If the issue is the connection range (packages being dropped etc): I think making sure that you are using the max tx output from your board, and that you have a good HW layout is a good recommendation. Have you had your HW reviewed here on devzone before - or are you maybe using DKs for this? We do both tune antennas and review layout for free here.

    If the issue is the practical range in which the results are accurate: get a good algorithm from a third party.

    Regards,

    Elfving

Reply
  • 0

    Hi,

    What ranges are you having an issue reaching? And are you able to get the connection, just no reasonable results? 

    My understanding is that if you want really high ranges, then it is also "considered CS" if you just use the Bluetooth LE round-trip timing, which means that you are just limited by the BLE range, which can be rather high (although maybe not in a warehouse setting). 

    I should also say that CS, much like direction finding, is limited by the algorithm you are using to interpret the i/q values. What we offer is a good way to get these I/q values. We also offer an algorithm that does an ok job at processing them, though for the best performance, I would definitely hope that you contact a third party that provides good algorithms for processing them - we do not claim to be the best at that part.

    1. Does Bluetooth Channel Sounding on the nRF54L15 currently support an external FEM/LNA/power amplifier?

    2. Is FEM/LNA support planned for a future NCS release?

    I can't comment on future plans, for that you would have to talk to your regional sales manager. Ask me if you would like his/her contact details.

    But my understanding is that since CS is a very time sensitive thing, using a FEM wouldn't work. And that is a theoretical limitation; I am not sure how you would make that work with an update to NCS in the future. This also excludes coded phy.

    3. Is Nordic planning any Bluetooth Channel Sounding device with higher TX power than the nRF54L15 QFN?

    I can't comment on future plans. 

    4. What is the officially recommended way to increase Channel Sounding range at this time?

    If the issue is the connection range (packages being dropped etc): I think making sure that you are using the max tx output from your board, and that you have a good HW layout is a good recommendation. Have you had your HW reviewed here on devzone before - or are you maybe using DKs for this? We do both tune antennas and review layout for free here.

    If the issue is the practical range in which the results are accurate: get a good algorithm from a third party.

    Regards,

    Elfving

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