On Dec 7, 2007, at 10:00 PM, Vijayant Bhatnagar wrote:
Hi,
I read a paper on tossim, wherein it has been mentioned that TOSSIM
doesnt consider modulation scheme but uses SNR/PRR curves. Now, in
that case how can I measure PER for a mote ? Secondly, is this
dynamic or static ?
Any help is appreciated.
TOSSIM in TinyOS 2.0.2 uses a link gain graph, combined with
statistical interference signatures generated using the closest
pattern matching (CPM) algorithm[1]. It uses SINR and packet timing
to decide if a packet arrives successfully (e.g., stronger-first can
arrive, but stronger-second cannot once the node has locked onto the
preamble sequence). It does not consider packet length when computing
PRR from SINR.
Phil
[1] HyungJune Lee, Alberto Cerpa, and Philip Levis. "Improving
Wireless Simulation Through Noise Modeling." In Proceedings of the
Sixth International Conference on Information Processing in Wireless
Sensor Networks (IPSN), 2007.
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