> I've read in the forum that there are three main values for signal
> quality (tinyos, tossim 2.x) :
>
> - the power which traduce the signal power (i've read in tossim the
> power is set up to 0 dB and then it is equal to gain value entered)
Correct. Signal power (in dBm) at the receiver is the same as gain
since it is assumed that the sender sends at 0 dBm.
> - SNR (signal to noise ratio) : equal to the difference or the ratio
> between the noise and the signal (so if my gain is equal to -4db and
> my NF is equal to -90dB, SNR= -4--90 = 86dB )
Correct.
> Does this following points are correct?
>
> - the SNR traduces the distance between the noise and the signal and
> so the bigger it is the better the signal become
At a higher SNR, there is a higher probability of packet reception.
So in this sense, the link becomes better. But this is not
necessarily due to a higher signal power.
> - i've read that on real hardware, the RSSI must a be positive value...
Can you please provide the reference?
> - tossim doesn't allow to set up the signal power so Power = Gain?
I don't quite understand what you mean.
Tal
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