On Jul 4, 2006, at 7:42 AM, Liu Haibin wrote:
Hi,
I have a question about the setNoise(node, mean, variance) in
TOSSIM 2.x. I found that the larger the mean is, the more noisy it
is. For example, setNoise(1, -100, 5.0) can make nodes receive
packets, but setNoise(1, -10, 5.0) cannot. I was expecting to see
that -100 would mean more noisy that -10. Did I get the concept
wrong? So what does the noise here mean? Many Thanks.
The noise is in dBm. So -10 is stronger noise than -100.
One note: the current noise model has a few issues. Since the
distribution is bounded in the interval [mean - var, mean + var],
then you see 100% links more suddenly than you often do in the real
world. It really should be gaussian, with perhaps some greater
complexities. We've been looking at some long-term traces for micaZ
and telos networks in order to try to come up with a more
representative noise model, and hope to have one by the end of the
summer.
Phil
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