Thanks Sergio, I have a couple of nodes sending packets to a sink. The Tx power is predefined, though obvious the RSSI values at receiver side vary a lot. What I want to do is to assess how desirable a channel could be for my network by reading the RSSI value from the register when no nodes are sending/receiving. I guess it could be called environment interference, if noise floor is too ambiguous a name.
So do you think this is a feasible method? Regards, Peng On 31 May 2011 23:37, Sergio Valcarcel <[email protected]> wrote: > Hi Peng, > For a given bandwidth, the capacity of a channel is function of the signal > to noise ratio. Neither the noise, nor the signal alone, but what matters is > how larger is the signal with respect to the noise. In fact, you should > treat as noise any other channel disturbance, like interference. > If there is very low noise floor but the transmitter is very far away, the > S/N ratio will still be low. > However, you could parametrize your set-up, with a lot of assumptions, like > number of nodes, maximum and minimum transmitting power, maximum and minimum > distance between Tx and Rx, channel model, etc. > Then, you could establish bounds in the performance. But I do not know > whether this is what you have in mind... > Cheers! > Sergio > On Tue, May 31, 2011 at 8:14 PM, Peng Du <[email protected]> wrote: >> >> Hello everyone, >> >> I have been wondering the significance of the noise floor (in this >> context, the RSSI value read from the register when no communication >> is underway). Does it in some way reflect the likelihood that packets >> sent in certain channel will be successfully received (The Packet >> Delivery Rate)? >> >> I would guess channel with lower noise floor should be more >> preferable. But does anyone have any opinion or could point me to some >> useful resource that explains this? >> >> Thanks very much! >> >> Best regards, >> >> Peng >> _______________________________________________ >> Tinyos-help mailing list >> [email protected] >> https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
