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Old 07-31-2011, 12:45 PM
atec77
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Default whats this dido claim ?

http://venturebeat.com/2011/07/28/st...ss-data-rates/
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Old 07-31-2011, 03:25 PM
Jeff Liebermann
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Default Re: whats this dido claim ?

On Sun, 31 Jul 2011 22:45:13 +1000, atec77 <atec77@hotmail.com> wrote:

>http://venturebeat.com/2011/07/28/st...ss-data-rates/


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

Cute. Assuming it works, it only addresses what users hear from a
central access point, and ignores any traffic in the other direction.
Presumably, he's talking about UDP broadcasting via Wi-Fi. It also
seems to require that neighborhing WLAN's coordinate their signals,
which is in direct violation of the FCC rules designed to prevent one
user from monopolizing all the airtime.
<http://louise.hallikainen.org/FCC/FccRules/2011/15/247/>
The coordination of frequency hopping systems in any other
manner for the express purpose of avoiding the simultaneous
occupancy of individual hopping frequencies by multiple
transmitters is not permitted.
If coordinating access points were legally possible, you can be sure
that someone would have built a seamless handoff system or multicast
system.

The NVIS part is hillarious. It only works up to an MUF (maximum
usable frequency) of about 2-8Mhz, which is much too low in RF
frequency to carry much more than maybe a hundred baud.

He then goes on to claim 1 msec latency, which is improbable because
his scheme has to do what appears to be high level number crunching in
order to generate a combined signal.

However, I have an open mind, especially since I thought that MIMO was
impossible when it was first introduced (mostly because none of the
explanations made any sense). I'm sure we shall soon see if "cloud
wireless" is real, or just blowing smoke.

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Jeff Liebermann jeffl@cruzio.com
150 Felker St #D http://www.LearnByDestroying.com
Santa Cruz CA 95060 http://802.11junk.com
Skype: JeffLiebermann AE6KS 831-336-2558

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Old 07-31-2011, 07:24 PM
Paul Cummins
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Default Re: whats this dido claim ?

In article <ipra37dofid0u8q4n8p4shg2u00tmclht7@4ax.com>, jeffl@cruzio.com (Jeff
Liebermann) wrote:

> which is much too low in RF
> frequency to carry much more than maybe a hundred baud.


Really?

How is it then my system using up to 2.2MHz gives me up to 24Mbps?

This DIDO appears to me to be a radio-based variant on ADSL.

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Paul Cummins - Always a NetHead
Wasting Bandwidth since 1981

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