[pushfoo]

TL;DR: Wi-Fi can already provide that signal.

We can already get full 3D pose estimation from Wi-Fi. Whether that's a good thing is a separate topic, but there's a recent paper[1] which also has a poster page[2] and a youtube video[3] embedded on it. The audio quality of the video is poor, however. There's a lot of echo.

This general line of work is what the comment from transpute[4] seems to have been implying. There's also a prior body of work on this which I'm not really familiar with.

[1]: https://openaccess.thecvf.com/content/CVPR2024/papers/Yan_Pe...

[2]: https://cvpr.thecvf.com/virtual/2024/poster/30463

[3]: https://www.youtube.com/watch?v=39oG-PJIZ14

[4]: https://news.ycombinator.com/item?id=40893391