There is a graph that shows a dependence between distance and PRR, LQI, and RSSI in the paper about Telos design (figure 5 in http://www.polastre.com/papers/spots05-telos.pdf) While it does not actually show the regression, and distance is made explicit, it should at least give you a flavor of what to expect out of each type of measurement
Rob On 5/9/06, Prabal Dutta <[EMAIL PROTECTED]> wrote:
Yes, there is *some* relation: they're positively correlated. But on the CC2420 radio, LQI shows significant variance for a given packet reception rate (PRR). You may be much better off using RSSI, which shows far less variance for a given PRR. You can use (logistic) regression to determine the relationship the variables: - send a lot of packets between a lot of motes - compute the PRR as the fraction of packets received over the number sent for each tx, rx link pair - note the RSSI and LQI values - Plot (and regress) PRR vs RSSI and PRR vs LQI Hope that helps. - Prabal On 5/9/06, Venkat Manoj <[EMAIL PROTECTED]> wrote: > > Hi all, > > Can anybody tell me if there is some relation between the link quality > indiactor (LQI) and the probability of packet loss, between two motes? Or is > there some method to find out the relation? > > Thanks, > Venkat. > _______________________________________________ > Tinyos-help mailing list > [email protected] > https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help > > > _______________________________________________ Tinyos-help mailing list [email protected] https://mail.millennium.berkeley.edu/cgi-bin/mailman/listinfo/tinyos-help
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