There are dozens+ papers like that specifically focused on mm-wave stuff, "passive" localization/identification/sensing. Gait doesn't go far enough to describe

There are dozens+ papers like that specifically focused on mm-wave stuff, "passive" localization/identification/sensing. Gait doesn't go far enough to describe it. It's basically the equivalent of face recognition tech but in the mm-wave spectrum with standard router hardware. The various mm-wave bands being used in 5G (and being proposed for "6G") are much more dense (spatially and information theoretically) than the < 5GHz bands, but sparse enough compared to visible light that many obstacles are quite translucent. mm-wave antenna arrays are kinda just big low frequency eyeballs. Here's an old comment with some references: https://news.ycombinator.com/item?id=22480444 https://news.ycombinator.com/item?id=22480444 And a video to drive it home: https://www.youtube.com/watch?v=kBFMsY5ZP0o https://www.youtube.com/watch?v=kBFMsY5ZP0o