Channel Sounding Accuracy Issues nRF54L15-DK

RE: Channel Sounding Accuracy Issues nRF54L15-DK

Simonr — Wed, 17 Sep 2025 11:39:41 GMT

An office environment generally has quite a bit of noise on the 2.4GHz band in my experience, with phones, Bluetooth devices like mice, keyboards and headsets etc.

Also the measurement station you have constructed puts a metal bar pretty close to the antenna, which might affect the measurements you're seeing. When doing channel sounding some false measurements like the ones dropping closer even though the actual distance increases must be expected since there might be noise or a packet loss occurring, so if you need more filtered measurements you can sample a few of them and take the best estimate based on a couple of them.

I don't have the details on what was used in the demo I'm afraid as that was built on an older NCS version and older channel sounding algorithm than what is in NCS 3.x.x. In the end, you can't expect much better than 0.5m measurements I'm afraid.

Best regards,

Simon

RE: Channel Sounding Accuracy Issues nRF54L15-DK

TaSu — Thu, 11 Sep 2025 12:56:29 GMT

Hello Simon.

We built a measurement station such that the devices will stay in place during measurements. (See picture)
The measurements took place in a “normal” indoor/office environment, I would say.

I was not aware of the +/- 50cm accuracy. I think I read that the accuracy should be up to +/- 10cm which would be much better. I also do not understand how the demonstration could have had so much better accuracy that what I am currently measuring. Can you give me some information what parameters were used during this demo? Or can you at least give me a hint which parameters I can take a closer look at?

I have also detected that even with a constant movement away from each other, the devices sometimes detect movements closer to each other. (See diagramm) Do you have any idea why this is happening?

Thanks in Advance,
Tanja

RE: Channel Sounding Accuracy Issues nRF54L15-DK

Simonr — Thu, 11 Sep 2025 11:07:19 GMT

We are still in the process of improving and optimizing the channel sounding measurement procedure, so we don't have any guarantees for accuracy just yet I'm afraid. The accuracy will vary depending on a lot of factors, like environmental noise, line of sight, etc.

According to the Bluetooth SIG's marketing material, the Bluetooth Channel sounding is only typically able to achieve an accuracyt of +/- 50cm, so I would say your closest measurements look good at least. Can you share some more details on how you are testing this on your end, what environment etc. you're in?

Best regards,

Simon