How to represent time versus Pathloss ? V2V data at 5.9 GHZ

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youcha
youcha 2019-9-8
评论： Renato SL 2019-9-12
I would like to represent a figure of the path loss as a funcion of time. I know that
The PL0* term can be approximated to free space attenuation L=20*log10(4*π*d0*λ).
But I don't know how to get the value of the path loss exponent and the variable X. Can anyone help me to resolve this in order to do the representation I mentioned before??
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youcha
youcha 2019-9-11
I have attached the representation you asked for.
In my case, the observation time window (Sample size) is used for the caracterization of the small scale fading statistics of the channel. the length of the window should be chosen such that the stationarity length of the process is not exceed. On the other hand, a large number of samples is needed in order to obtain meaningful statistical results.
Capture2.PNG
Renato SL
Renato SL 2019-9-12
I searched about stationarity just now, so now I see what you mean.
Based on the time plot, from a quick observation, I would think about (26s to 39s), (72s to 87s), (110s to 150s), or (150s to 162s). Those periods looks interesting for me, but again, just from a glance of the time plot.
You can try to plot the ideal pathloss value alongside the measurement data, I guess. Maybe it could also help you decide which is the best window.

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