On May 10, 2010, at 10:04 PM, Yi Tang wrote:
> Hi All,
>
> Does TOSSIM 2.x really flip bits in the packet (according to the SNR-based
> packet error model), as it did in TOSSIM 1.x?
>
> I see that TOSSIM 2.x decides whether a node can receive a packet based on
> the radio model (in CpmModelC.nc), yet it seems that the node will receive a
> bit-error-free packet once the simulator decides that it can receive it.
>
> Please correct me and point me to the relevant source code if I'm wrong.
It does not; TOSSIM in 2.x uses an SNR-based packet model. Unlike the packet
models in 1.x, this one handles collisions, external interference, and the RF
capture effect. The major missing piece (and why the results can be misleading
compared to a real network and are insufficient by themselves) is that signal
strength is a constant; in reality it varies over time.
Phil
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