Hello all,
The issue of bad sensitivity in OFDM modes is one that we have come
across in our networks. For many links, the theory says that the link
should work, and in 11b mode, it does. However, when we run these
links in 11a, we see very high packet loss ( >70% as was mentioned).
This is not due to ACK timeouts - we simply do not see the packets
and this has been verified using monitor mode captures. Packets we do
see have sensible SNRs which are in line with our theoretical link
models.
Unfortunately we have no idea where to start with debugging this
problem. However, we are extremely keen to talk to people who have
some knowledge of the workings of the chipsets as well as others who
also experience this problem. We are happy to provide real-world
environments to measure and to test ideas on.
The issue of calibration has come up. My only concern is that we are
not really clear as to what calibration actually achieves, how often
it should be done, etc. I plan to write an email to Sam Leffler
asking for some first-hand knowledge of the calibration procedure,
what it's effects are and when it should occur in order to try and
solve this. I'll post any results from that discussion here.
In summary, we also see the problems mentioned with OFDM sensitivity
and are very keen to spend some time trying to solve it. Maybe others
who see this problem can chime in, even if it is only to add another
data-point.
Cheers,
--
Scott Raynel
WAND Network Research Group
Department of Computer Science
University of Waikato
New Zealand
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