The patent, like our audio process, is about sending a particular
signal whose center can be precisely localized even in noisy,
reverberant environments, and then using pairwise exchange of data to
do localization even when initial delays are unknown. In other words,
a message goes out tel
On Apr 6, 2008, at 7:27 PM, Ryan Crawford Comeaux wrote:
> Michael -
>
> Do you think the patent you're referring to would be a significant
> roadblock in implementing this system using wifi signal strength
> measurements? The few patents that I've seen (though I haven't
> been actively se
I'm not very concerned about FUD (fear, uncertainty, and doubt) being spread
by providers of a competing operating system. The inclusion of GPS data
into the system would be purely optional and currently and the XOs do not
have GPS capabilities. A software implementation COULD be put in the syste
I don't want to rain in anybody's party, but sadly the matter of a GPS
related to the OLPC project has already become a matter of uninformed
attack. This is obviously a dissatisfied person's conspiracy theory,
and I feel embarrassed to even repeat it, but Mr. Olivera of Argentina
is telling an
Yes, the Master's thesis that Wad referenced discusses the error
issue, and how to make best use of pairwise measurements when you
have more than three machines...
Incidentally, there is a patent on doing the same thing with RF that
Ben Dalton and I did with audio.
--M.
On Apr 5, 2008, at
On Fri, 4 Apr 2008, John Watlington wrote:
> A guiding design principle for any XO activity is that it be designed
> to work without a school server. Learning doesn't stop at the school gate!
>
> The only thing special about an XS (or any access point) is that we can
> know (absolutely) where it
On Fri, Apr 4, 2008 at 10:18 PM, John Watlington <[EMAIL PROTECTED]> wrote:
> ...I still prefer the idea of using audio...
>
The effective acoustic range is probably similar to the line of sight for XO
users. Far more interesting, in my opinion, would be locating other users
in radio or network
A guiding design principle for any XO activity is that it be designed
to work without a school server. Learning doesn't stop at the school
gate!
The only thing special about an XS (or any access point) is that we can
know (absolutely) where it is. Whatever system is designed should
allow arbi
why exactly is an XS needed at all - what about just a mesh of laptops with
no XS. I agree then there are NO refrence points at all, so orientation and
world-position of the generated map can't be determined, but the rest of the
info still remains useful. The XS is simply another node - there is
Just to address a few other issues/questions raised...
If there is only one antenna on a server, then as long as 3 other nodes are
considered relatively stationary, I think their 2D locations can be deduced
from each node's measurements of the other 4. An easy to use interface can
allow the user t
On Thu, Apr 3, 2008 at 8:55 PM, <[EMAIL PROTECTED]> wrote:
> On Thu, 3 Apr 2008, Michail Bletsas wrote:
>
> Let's not forget that you need some fixed reference points.
> > In commercial systems, the locations of the access points are well
> > known.
> > In ad-hoc networks the best that you can ho
On Thu, 3 Apr 2008, Michail Bletsas wrote:
> Let's not forget that you need some fixed reference points.
> In commercial systems, the locations of the access points are well known.
> In ad-hoc networks the best that you can hope for is a topological map.
the assumption was that the measurements a
Let's not forget that you need some fixed reference points.
In commercial systems, the locations of the access points are well known.
In ad-hoc networks the best that you can hope for is a topological map.
M.
[EMAIL PROTECTED] wrote on 04/02/2008 01:45:14 AM:
> Ryan,
>
> Like Ben said, induc
On Thu, 3 Apr 2008, Aaron Huslage wrote:
> How do currently available commercial wireless topology mappers do this?
>
I don't have direct experiance (the brother of a friend goes around
installing these things, so my knowledge is third hand)
but my understanding is that they deploy their access
How do currently available commercial wireless topology mappers do this?
On Wed, Apr 2, 2008 at 7:59 PM, <[EMAIL PROTECTED]> wrote:
> On Wed, 2 Apr 2008, Hal Murray wrote:
>
> > Date: Wed, 02 Apr 2008 15:49:38 -0700
> > From: Hal Murray <[EMAIL PROTECTED]>
> > To: Martin Langhoff <[EMAIL PROTECTE
> The recommended configuration for mid-to-high-end school servers has 3
> active antennaes attached, and our recommendation is that they are
> placed well apart. They can be up to 10m apart due to USB cable lenght
> limits, and Wad mentioned 2m minimum recommended distance. If the
> distance is e
On Wed, 2 Apr 2008, Hal Murray wrote:
> Date: Wed, 02 Apr 2008 15:49:38 -0700
> From: Hal Murray <[EMAIL PROTECTED]>
> To: Martin Langhoff <[EMAIL PROTECTED]>
> Cc: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED],
> [EMAIL PROTECTED], server-devel@lists.laptop.org,
> Ryan Crawford
On Wed, Apr 2, 2008 at 3:38 PM, <[EMAIL PROTECTED]> wrote:
> the problem with trying to use sound is that it requres a clear path from
> the servers to the laptops, something I would not expect to see very much.
> it's also very sensitive to the direction the laptops are pointing.
Absolutely, an
>
> the commercial products are able to do it with unmodified laptops, so it
> should not require a change to the over-the-air signal (unless this
> generation of active antenna hardware isn't up to the task)
>
I'd be very innterested to know how they work - I can't see any way it could
work using
On Wed, 2 Apr 2008, Polychronis Ypodimatopoulos wrote:
> Ryan,
>
> Like Ben said, inducing the physical layout of the network from metrics
> such as RSSI will give you poor results for various reasons. What
> "Space" did was to average arrival rates from direct neighbors over a
> "long" period of
Ryan,
Like Ben said, inducing the physical layout of the network from metrics
such as RSSI will give you poor results for various reasons. What
"Space" did was to average arrival rates from direct neighbors over a
"long" period of time (anywhere between 1 and 10 seconds) to avoid
highly tempor
On Wed, Apr 2, 2008 at 4:27 AM, <[EMAIL PROTECTED]> wrote:
> trying to work from signal strength won't work well, but you may be able
> to triangulate based on the arrival time of the signal at various
> locations.
>
> there are companies that do this commercialy with 3+ access points
The rec
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