Multi-Connections at same time possible on newest version of Channel Sounding for ranging Initiator/Reflector?

[NickDeLeenheer]

Hi,

I was wondering if the newest sample available in NCS3.0.1 is already capable of holding multi connections. Otherwise, for this little time that is present i will do my own implementation to connect with the boards sequentially...

Also, would it be hard to implement multiple antennas to my nRF54L15 boards? I think that multiple antenna paths would increase accuracy, since the accuracy of the distance estimation is very dependent on the specific shortest path that it found. nRF54L15 only has 1 Antenna path (i Think). And if it has more, is it easy to configure multiple antenna paths?

A last question on how to improve accuracy: Is the ifft better for inside? It uses the same phase samples as the Phase Slope method, but i was wondering how it works and where i can find the implementation, because it seems better for now. I also was wondering why it is now taking longer to get my distances with the same configuration compared to the previous version of this sample?

Kind regards,

Nick De Leenheer

[Elfving]

Hi Nick,

It's possible to run CS on multiple connections at the same time. We don't make much effort to avoid scheduling conflicts however so parameters and kconfigs have to be selected carefully. One thing to note that if you have issues with this, one usual suspect is that you haven't increased BT_CTLR_SDC_CS_COUNT.

Is your end-goal to trilaterate a position? 

Also, would it be hard to implement multiple antennas to my nRF54L15 boards? I think that multiple antenna paths would increase accuracy, since the accuracy of the distance estimation is very dependent on the specific shortest path that it found. nRF54L15 only has 1 Antenna path (i Think). And if it has more, is it easy to configure multiple antenna paths?

Could you expand a bit on what you mean by this, and "antenna paths"? EDIT: I see now that we support multiple antennas for CS much like DF. This was news to me. That is what is being referred to by antenna paths. The NRF54L15DK just has one paths, but you could connect more.

The nRF54L15DK has one antenna on it. You can however connect a different antenna on it as well. I am not so sure if something along the lines of a antenna matrix (like what you use for direction finding) would be able to improve anything here.

A last question on how to improve accuracy: Is the ifft better for inside? It uses the same phase samples as the Phase Slope method, but i was wondering how it works and where i can find the implementation, because it seems better for now. I also was wondering why it is now taking longer to get my distances with the same configuration compared to the previous version of this sample?

Not necessarily. This older webinar goes through the differences.

Regards,

Elfving

[NickDeLeenheer]

Hi,

Thank you for your input on this matter, i will look into parallel connections later.

But for now, i already succeeded in multiple connections being hold SEQUENTIALLY for my older version, i a almost succeeded in this matter using the new sample from Nordic.

I would like to get the problem that i stated in my other thread: "Ranging CS data from multiple connections", to be fixed by this Thursday, since i will be doing measurements with my thesis supervisor.

It's a problem with the fact that we don't get succesfull data steps anymore, so the distance estimates are not getting updated (data_complete) ...

If you could take a look at that thread, or if another engineer can help me with this quickly, i would be very happy.

Kind regards,

Nick De Leenheer

[Elfving]

Great

NickDeLeenheer said:

I would like to get the problem that i stated in my other thread: "Ranging CS data from multiple connections", to be fixed by this Thursday, since i will be doing measurements with my thesis supervisor.

It's a problem with the fact that we don't get succesfull data steps anymore, so the distance estimates are not getting updated (data_complete) ...

If you could take a look at that thread, or if another engineer can help me with this quickly, i would be very happy.

A coworker of mine is assigned to it, and will look into it in time. Though it is hard to say if we'll be able to fix something for you there by Thursday.

Regards,

Elfving