[Starlink] [Cake] [Make-wifi-fast] [Cerowrt-devel] Due Aug 2: Internet Quality workshop CFP for the internet architecture board

[Bob McMahon]

We have hundreds of test rigs in multiple labs all over geography. Each rig
is shielded from the others using things like RF enclosures. We want
reproducibility in the RF paths/channels as well as variability. Most have
built fixed rigs using conducted equipment. This is far from anything real.
A butler matrix produces great condition numbers but that makes it too easy
for MIMO rate selection algorithms.

Our real world test is using a real house that has been rented. Not cheap
nor scalable.

There is quite a gap between the two. A RF path device that supports both
variable range and variable mixing is a step towards closing the gap.

Bob

On Sat, Aug 7, 2021 at 10:07 PM Dick Roy <dickroy at alum.mit.edu> wrote:

>
>
>
> ------------------------------
>
> *From:* Starlink [mailto:starlink-bounces at lists.bufferbloat.net] *On
> Behalf Of *Bob McMahon
> *Sent:* Monday, August 2, 2021 6:24 PM
> *To:* Leonard Kleinrock
> *Cc:* starlink at lists.bufferbloat.net; Make-Wifi-fast; Cake List;
> codel at lists.bufferbloat.net; cerowrt-devel; bloat
> *Subject:* Re: [Starlink] [Cake] [Make-wifi-fast] [Cerowrt-devel] Due Aug
> 2: Internet Quality workshop CFP for the internet architecture board
>
>
>
> I found the following talk relevant to distances between all the nodes.
> https://www.youtube.com/watch?v=PNoUcQTCxiM
>
> Distance is an abstract idea but applies to energy into a node as well as
> phylogenetic trees. It's the same problem, i.e. fitting a distance matrix
> using some sort of tree. I've found the five branch tree works well for
> four nodes.
>
> *[RR] These trees are means for approximating a higher dimensional
> real-world problem with a lower dimensional structure.  You may be doing
> this to save hardware when trying to cable up some complex test scenarios,
> however I’m wondering why?  Why not just put the STAs in the lab and turn
> them on rather than cabling them?*
>
>
>
> Bob
>
>
>
> On Mon, Aug 2, 2021 at 5:37 PM Leonard Kleinrock <lk at cs.ucla.edu> wrote:
>
> These cases are what my student, Fouad Tobagi and I called the Hidden
> Terminal Problem (with the Busy Tone solution) back in 1975.
>
> Len
>
>
> > On Aug 2, 2021, at 4:16 PM, David Lang <david at lang.hm> wrote:
> >
> > If you are going to setup a test environment for wifi, you need to
> include the ability to make a fe cases that only happen with RF, not with
> wired networks and are commonly overlooked
> >
> > 1. station A can hear station B and C but they cannot hear each other
> > 2. station A can hear station B but station B cannot hear station A 3.
> station A can hear that station B is transmitting, but not with a strong
> enough signal to decode the signal (yes in theory you can work around
> interference, but in practice interference is still a real thing)
> >
> > David Lang
> >
>
>
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