Steve Perlman Releases Whitepaper on Wireless DIDO Tech

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tech lover

Jul 29, 2011
He used the wrong version of Shannon's law. Shannon's celebrated results are a lot more general than what he showed. He just used the wrong formula to predict the performance.


Feb 25, 2011
[citation][nom]sseyler[/nom]Why do these articles refuse to explain HOW DIDO works? Does it not?[/citation]

probably because it's still in the "patent pending" stage lol :p


Jul 24, 2009
Watch wireless providers try to slam this shut. This might upset tiered bandwith internet plans. They'd have no justification to throttle a user's access if they didn't have to for infrastructure reasons. A level playing field is just not a republican ideal.


I read the PDF whitepaper; interesting concept but I remain unconvinced this will work (i.e. scale to real-world network environments). Essentially it's using the distributed network of APs to perform a kind of "beam-forming" rather than using a centralised phased-array antenna to achieve the same. I believe in practice that intractible issues of multipath and constantly time-varying channel parameters (due to passage of people, vehicles, multipath effects and the like) will result in a far less optimal outcome than conventional beam-forming where at least all signals originate from a single point and are subject to the same channel variance and multipath effects.

I have also seen no evidence in the paper to support a claim that the DIDO signal encoding algorithm can scale to produce a simultaneously correct "superposed" signal at EVERY receiver station as the amount of information down the channel increases (i.e. multiple downloads) and the number of participant receivers becomes large. I have not performed analysis but I find this idea to be extremely counter-intuitive. There are no free lunches in wireless comms.

I wish Perlman all the best and would love nothing more than to be proved wrong on each point above :)


I read the paper. It doesn't require an electrical engineering degree to understand (just common sense and a basic tech level). Basically, from my understanding, DIDO works differently than wireless. Wi-fi send a wave form to your device and as such many wi-fi access point that are close sending wave form in the same frequency will create interference and reduce your bandwidth (speed?).

DIDO works by offloading the wave form creation to a server. Basically the server calculates the precise waveform needed so that if you have 5 access point broadcasting, when all those 5 wave form hit your device the overlap will create a perfect waveform for you (and the same happens with other devices).

It is very interesting and I think it will work... This is just mind-boggling!!!
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