Page last updated on: Sunday, February 23, 2014 A new approach to multi-user wireless Radio amateur Dr. Antonio Forenza AG6NA has published a paper on Distributed-Input-Distributed-Output (DIDO) Wireless Technology which can be used for HF Near-Vertical Incidence Skywave (NVIS)



The paper, which was co-authored with Rearden Companies CEO Steve Perlman, says:



Distributed-Input-Distributed-Output (DIDO) wireless technology is a breakthrough approach that allows each wireless user to use the full data rate of shared spectrum simultaneously with all other users, by eliminating interference between users sharing the same spectrum. With conventional wireless technologies the data rate available per user drops as more users share the same spectrum to avoid interference, but with DIDO, the data rate per user remains steady at the full data rate of the spectrum as more users are added.



DIDO works indoor/outdoor for urban/suburban applications at distances of several miles, and for rural applications, DIDO works at distances up to 250 miles [400 km - NVIS].



A key limitation for data communications using the HF bands that work with NVIS is that they are very narrow and a large percentage of the HF band would have to be used to provide sufficient data rate for broadband applications to even one user in the entire 500-mile area. Of course, DIDO would be an ideal technology to overcome this limitation because a large number of users can simultaneously use all of the available spectrum, each receiving the full data rate available in the HF channel.



Download the paper at

http://www.rearden.com/DIDO/DIDO_White_Paper_110727.pdf



Read the IEE article at

http://spectrum.ieee.org/tech-talk/telecom/wireless/

5g-service-on-your-4g-phone



A 2011 Bloomberg article says tests to date have been conducted on the amateur radio spectrum with a maximum of 10 people communicating simultaneously, see

http://www.businessweek.com/magazine/the-edison-of-silicon-valley-07272011.html#p5



Rearden Companies [named after character in Ayn Rand book Atlas Shrugged]

http://www.rearden.com/



Radio amateur develops experimental wireless technology

http://www.southgatearc.org/news/july2011/dido_technology.htm

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