How can I extract raw IQ data for multi carrier phase ranging using nrf5340dk？

[xu shengxian]

I tried running the "Bluetooth: nRF Distance Measurement with Bluetooth LE discovery" case in the SDK, here is its link：Bluetooth: nRF Distance Measurement with Bluetooth LE discovery.But this case can only obtain the final distance measurement value. I want to obtain raw IQ data from it for algorithm research, that is, to evaluate the MCPD algorithm.I found the original IQ data in an nrf_dm. h header file'nrfxlib API: nrf_dm/include/nrf_dm.h Source File', but it seems that the related functions were only declared without implementation, and I couldn't find the corresponding implementation. When I tried to compile, it showed that I couldn't find the implementation of the function.That is at line 341 of this code'void nrf_dm_populate_report(nrf_dm_report_t *p_report);'.I don't know how to extract the raw IQ data, and it doesn't seem to be mentioned in the document. I want to know if nrf5340dk supports extracting raw IQ data for MPCD algorithm ranging? Or do we only provide distance measurement results without providing raw data?

Thank you in advance for your help！

[tesc]

Hi,

nRF5340 does support extraction of IQ data.

The most notable example of IQ sample extraction is for Bluetooth Direction Finding, where you get a number of IQ samples in an IQ samples report.

Also Bluetooth, the sample Bluetooth: Channel Sounding Initiator with Ranging Requestor provides a basic distance estimation algorithm to demonstrate the IQ data handling. (The algorithm there is not particularly good, though. The point of the sample is to show IQ data handling.)

The Nordic Distance Measurement library is a proprietary, pre-compiled library. The source code is closed, and we do not share it. That is the reason why you cannot use that library as reference, to see how to extract IQ data.

Regards,
Terje

[xu shengxian]

Thank you very much for your help!Unfortunately, nrf5340dk does not support this example. 

tesc said:

Bluetooth: Channel Sounding Initiator with Ranging Requestor

 

[Kenneth]

You are right, if you want to try this example, please order yourself an nRF54L15 DK. For new designs using the nRF54-series might be a good suggestion overall.

Kenneth

[xu shengxian]

Thank you！