[Tinyos-help] RSSI and TOSSIM

[Tal Rusak]

Hi,
     I noticed that TOSSIM uses the following formula to compute RSSI:    
rcv->strength = (int8_t)(floor(10.0 * log(pow(10.0, power/10.0) +
pow(10.0, noiseStr/10.0)) / log(10.0)));
(in CpmModelC.nc)
     I notice that this is adding the signal power (gain) and noise
levels. I am wondering if this is a true reflection of the physical
phenomenon--i.e., in the CC2420, when RSSI is computed
(CC2420Packet.getRssi(packet)), do signal and noise strength
contribute in an additive fashion? Are there any paper or documents
that support this notion?
     I appreciate any response in advance.

Thanks,
Tal

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