Could wireless replace wearables? | MIT News Office: As described in an earlier MIT News story, the system works by transmitting a low-power wireless signal and using its reflections to track moving humans. It can do so even if the humans are in closed rooms or hiding behind a wall.
As the signal is transmitted at a wall, a portion of the signal penetrates through, reflecting off a person on the other side. However, due to all the signal interference from other objects, the team had to create technology to cancel out irrelevant reflections.
In order to monitor breathing, the technology needed to be precise: The researchers created a complex metric that approximates the subject’s volume, and then observed and amplified its changes to distinguish the breathing.