Having trawled through some more of their content, if you are after genuine technical detail it is still pretty light but the Stanford University Lecture does give a more substantive overview of what is involved with some more interesting Q&A.
I thought that a somewhat telling comment at the end of the Stanford video is that they see themselves as a software defined radio company and by inference they would really like to give the rest of the problem away to operators, hardware vendors etc. That seems in keeping with my perception that the most significant thing they have done is to build systems that can do all the required real time processing which they would love to sell to everyone. -----Original Message----- From: Paul Sladen [mailto:[email protected]] Sent: 10 December 2014 00:43 To: Ian Tomkins Cc: Gord Slater; UKNOF Subject: Re: [uknof] High Density Wifi 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 ________________________________ This communication contains information which is confidential and may also be privileged. It is for the exclusive use of the intended recipient(s). If you are not the intended recipient(s) please note that any distribution, copying or use of this communication or the information in it is strictly prohibited. If you have received this communication in error please notify us by email ([email protected]) or by telephone +44 (0)203 3716666 and then delete the email from your system together with any copies of it. All communication sent to and from Modrus Limited is subject to monitoring of content. By using this method of communication you give consent to the monitoring of such communications. Any views or opinions are solely those of the author and do not necessarily represent those of the companies listed below unless specifically stated.' Modrus Limited is registered in England and Wales (no. 5022857). The registered office of Modrus Limited is Midland House, 2 Poole Road, Bournemouth, Dorset BH2 5QY.
