[Tinyos-help] Implementation of CompareBit interface

[Omprakash Gnawali]

On Mon, Aug 11, 2008 at 5:58 PM, Tao Liu <liu3tao at gmail.com> wrote:
> Hi Omprakash,
>
> Thanks very much for the reply. I also have a small  irrelevant
> question here. I am doing some experiments about the performance of
> the new 4bit link estimator using tmotes, which use Chipcon CC2420
> radio chip. I noticed in the chips/cc2420/packet/CC2420PacketP.nc, a
> channel is considered of high quality when the LQI value is greater
> then 105 (line 107). That's where the white_bit come from. I am
> wondering why  LQI > 105 indicates a high channel quality? Is there
> any physical or empirical reason behind the value?

A combination of empirical results (some of Phil Levis' publications),
intuition, and confirmation through experiments. In other words, guess
based on experience.

- om_p