Thanks you all for the replies. Another question: I know a node performs clear channel listening before sending packets - is the result depend on the channel it is using or traffic on any channel will make the node to back off?
Regards, Peng On 15 June 2011 17:12, Jan Hauer <[email protected]> wrote: >> RSSI is measuring power, it does not matter quite much >> whether it comes from noise, interference or useful signal. > > Yes. Take a look at Fig. 2 in [1], where you can see RSSI measured > with high frequency on a telos node while two frames (IEEE 802.15.4 > DATA + WLAN Beacon) collide. There is rise in RSSI, because the > "colliding packet" is stronger. > > Jan > [1] http://www.tkn.tu-berlin.de/publications/papers/hauer_ewsn2010.pdf > > On Wed, Jun 15, 2011 at 5:00 PM, Sergio Valcarcel <[email protected]> > wrote: >> Hello Peng, >> it is quite simple. RSSI is measuring power, it does not matter quite much >> whether it comes from noise, interference or useful signal. >> That is the reason because there is another quality indicator which measures >> signal to noise ratio. >> Cheers! >> Sergio >> >> On Wed, Jun 15, 2011 at 4:14 PM, Peng Du <[email protected]> wrote: >>> >>> Hello everyone, >>> >>> I always thought the RSSI value read from received packets would fall >>> as the interference grows. However I just found that the reading >>> actually rises when I switch on a commercial interference generator.. >>> >>> Would anyone point out why this is happening? Thanks very much. >>> >>> 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 >> > _______________________________________________ Tinyos-help mailing list [email protected] https://www.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
