In the friis equation, the reference distance is 1m at the log distance path loss.
Then the formula would be:
Pr=PtArAt(λ/(4π))2/dα
where d is distance between terminals, Pr is received power, Pt is transmission power, Ar,At are the rx, tx antenna gains, respectively, and λ is wavelength.
It seems that the path loss exponent α is not mentioned.
But I haven't seen a case where this α isn't 2.
Is this α always 2 in the friis equation?
And can the simulation environment be used even if this α is not 2?