This assumes you don't leave your phone in the charger as you wander around your house.
I'm pretty sure all current technology only works with the have a wifi decide on your person. It is significantly easier to do this and for the most part good enough.
Not only can you detect motion and objects through physical mass using WiFi spectrum with a properly equipped device, you can detect if someone is breathing.
“What's more, this "Time Reversal Machine" technology is essentially just some clever algorithmic work with little burden on the processor, so it can potentially be added to any existing WiFi mesh routers via a firmware update. In other words, security system vendors should take note.”