On Tue, 9 Dec 2014, Ian Tomkins wrote: > In essence their technology seems to revolve around using software > defined radios to dynamically create radio interference patterns
To echo Ian's summary, it's real-time dynamic beam-forming the discrete "APs" are treated as a giant 3D phased array: "pCell demonstration at Columbia by Steve Perlman, CEO, Artemis Networks" http://youtu.be/5bO0tjAdOIw?t=26m (onwards) T+30m onwards is N times 4K content streaming T+39m has some heckling T+40m onwards has Matlab heatmap visualisation T+45m covers being backwards compatible with existing standards T+46m covers using licenced + unlicenced spectrem. T+51m the phased antennas are running at 1milliwatt What matters is having having immense backhaul from each phased antenna to the local datacentre, because what you're transferring is a I/Q (SDR) sampling of the radio spectrum. In summary this is the ultimate solution, and it's the practical one because the hardwork is all on the infrastructure side and requires zero-change on the device and protocol side. The hard parts are: 1. Using the return signals for position tracking 2. Recomputing the beam-forming matrix in near-realtime 3. Calculating and distributing those huge SDR I/Q streams It is possible to already encounter these types of techniques in a more familiar way: beam-forming can be used with a (phased) array of speakers to allow each person to hear their own music/telephone call without needing a phone to do it. This is used on a very small scale of advertising, but without the dynamic tracking. It's also used for RADAR, and spot-beam generation on communications spacecraft. -Paul
