[Tinyos-help] About Sensitivity and RSSI.

[Robert Szewczyk]

Yes, you can compare these powers directly. The sensitivity threshold
is -95 dBm, and consequently CC2420 will not report RSSI below that
threshold.   The RSSI reported is the absolute measure of the energy
in the incoming signal; you can access RSSI when there is no packet
being received, and there will be readings of high RSSI that will not
result in a packet reception. You can estimate noise and interference
by measuring the RSSI during the idle times.

Best regards,

Rob

On 2/7/07, 박판근 <qkrvksrms at gmail.com> wrote:
> Hello everyone.
>
> In CC2420 data sheet. it specifies the high sensitivity (-95dBm).
> Received power in cc2420 can be drived from RSSI value. (P  = RSSI + Offset
> (-45dB))
> The minimum RSSI value was -49dBm in my experiment. Therefore received power
> -94dBm  was the minimum power in Tmote Sky.
>
> Can i compare the minimum received power  -94dBm and sensitivity -95dBm,
> directly?
> I'm confused in this point.  Receiver sensitivity is the SINR (signal to
> noise and interference ratio) but we just compute the received power from
> RSSI value and Offset value.
> Does Offset (-45dB) contain noise and interference?
>
> Best regards
>
>
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