WiFi mesh networks can detect your breathing

A “Time Reversal Machine” setup consists of at least two hubs: one router is designated as an “Origin” transmitter, with the remaining routers acting as “Bot” receivers. A 5GHz signal is applied here (so it can be either 802.11a, 802.11n or 802.11ac), and to avoid interference, the signal consists of just CSI (channel state information) …

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