Hi Bob,
if you want to play, I can send you login to the remote desktop of this
kind of toy - R&S ESPI7
<http://www2.rohde-schwarz.com/product/ESPI.html>. It is test receiver
(for measuring very weak signals in the EMG compatibility tests
measurements) and spectrum analyzer up to 7GHz. As Lukas Turek
mentioned, it does NOT have the bandwith needed for full-fledged 802.11
measurements: its bandwidth is only 10MHz, so e.g. the 802.11 channel
power measurements can be done only by frequency sweeps (which are
slower than packet rates, therefore the measurements are inaccurate if
the power changes with each packet). The EPSI7 is connected to an Intel
Atom board with RB14 PCI-miniPCI bridge holding 3 miniPCI cards (e.g.
CM9, CM10, R52)
The ESPI7 is owned by other department, but I can ask them for another
one-week time slot for the TX power measurements.
But last month, we were lucky to receive grant from Cesnet
<http://www.ces.net/> so we can buy newer spectrum analyzer with better
bandwidth and also the SW options for analysis of 802.11a/b/g/n signals.
The grant project is aimed at building laboratory testbed for research
and development of 802.11 protocols and their applications. The testbed
will provide full remote control through the internet and will provide
all the necessary tools for analysis and generation of WLAN 802.11
signals in the 2.4 and 5 GHz frequency bands, specifically:
1. spectrum/vector signal analyzer with SW plugins for analysis of
802.11 a/b/g and 802.11n signals
2. vector signal generators with SW tools for generation of 802.11 a/b/g
and 802.11n signals, which can transmit arbitrary 802.11 packet with
arbitrary signal/noise levels and arbitrary distortion
3. RF interconnect network consisting of RF
couplers/splitters/dividers/switches, attenuators and coaxial cables
(even the very long ones used as delay lines), allowing accurate,
objective and repeatable measurements by elimination of all the ordinary
environment interferences and providing the possibility to model any
WLAN media special conditions like hidden nodes, interferences in the
channel or adjacent channel, signal delay etc.
The project was partly inspired by the Orbit project, but its objectives
are directed to the physical layer, therefore these expensive RF
test&measurements devices are necessary here.
We expect to have the lab at least partly functional by the end of
summer so we could present it at this year Wireless summit
<http://wireless.kernel.org/en/developers/Summits/Boston-2010> in
Boston, which would be perfect way to attract the most relevant users
and show them, how to work with the equipment. Hopefully we'll be able
to get some money for this trip.
Best regards,
Tomas Dulik
UAI FAI TBU in Zlin,
Nad Stranemi 4511,
76005 Zlín
phone +420 57 603 5187
Bob Copeland napsal(a):
If you have access to the kind of R&S analyzer used here, please share :)
http://bugzilla.kernel.org/show_bug.cgi?id=14566
(the drops might explain the problematic results?)
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