"The complete answer to this question is very long, involving immensely complex mathematics, very carefully designed software and hardware, and new data communications and modulation techniques."

None of which is discussed in the white paper. If I had to guess... It seems like a MIMO (Multi-Input, Multi-Output) technique that somehow uses the environment's impulse response (via the pilot signal) to achieve phased array-like spatial independence of signals. Without the "immensely complex mathematics," this white paper doesn't really deliver any insight -- no better than marketing speak IMO.