Hi!
About 2 months ago, a commit [1] to CpmModelC.nc that eliminates the
problem of receiving packets (non-zero PRR) for negative SNR also made a
significant change to the hardcoded PRR/SNR curve. This was not adequately
documented in the commit message and many people might not be aware of
this. Here is a plot that shows the differences:
http://bit.ly/znrwQ
The points represent the data collected by Yin Chen, a member of our lab.
In his tests the noise level was controlled by using a noise generator so
it covers a wide range. Similar data was also reported by the following
paper:
http://portal.acm.org/citation.cfm?id=1460427
So there are reasons to believe that even the current curve we have in the
tree is not the most accurate one. Caution is advised! :-)
[1]
http://hinrg.cs.jhu.edu/git/?p=tinyos-2.x.git;a=commit;h=afe96d7e2a3747bba450e3db88a89569a0ba53b6
--
Razvan ME
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