On Jul 6, 2006, at 11:21 AM, Adam wrote:
Hi,
Anyone has empirical results to adjust tranmission power of CC2420
based on
LQI -- like some linear equation? I have tried adjustLQI() in
MultihopLQI.nc, the return value is not stable and oscillate in a
large
range. Actually, I wonder why not use the original LQI in TOS_Msg
header?
Since CC2420 datasheet said: "A correlation value of ~110 indicates a
maximum quality frame while a value of ~50 is typically the lowest
quality
frames detectable by CC2420."
Anyone successfully get a linear relation between the LQI value and
actual
link quality?
It's not a linear relationship. Kannan recently published a paper
(EmNets 2006) that scratches the surface of the topic, and should
soon (in the next week) have a tech report that looks at it more
deeply. You can find the paper here:
http://csl.stanford.edu/~pal/pubs.html
Phil
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