This is an interesting thought. It wouldn't be more precise than the GPS tracker already in your pocket, but it does open up more info to people other than Goog

This is an interesting thought. It wouldn't be more precise than the GPS tracker already in your pocket, but it does open up more info to people other than Google. Also as a note, regular MIMO (not "massive") wouldn't provide location information as the scattering channel is generally considered random.