Monday, October 9, 2017
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) which is only used during mesh network configuration. Due 
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