In case of only slow fading ( shadowing ), it may have log-normal distribution with parameter \ sigma \; dB . In case of only fast fading due to multipath propagation, its amplitude may have Rayleigh distribution or Ricean distribution.
12.
I . e . W ^ + _ 1 has the Rayleigh distribution with parameter 1, the same distribution as \ sqrt { 2 \ mathbf { e } }, where \ mathbf { e } is an exponential random variable with parameter 1.
13.
In case of only fast fading caused by multipath propagation, the corresponding gain in Watts F _ g \; = \; 10 ^ { \ frac {-X _ g } { 10 } } may be modelled as a random variable with Rayleigh distribution or Ricean distribution.
14.
From the Rayleigh distribution of wind speed at the site of the building, it is possible to estimate the number of hours in a year during which the wind speed at a height of 10.0 m exceeds 7.83 m / s ( estimated from the wind speed of 5.7 m / s at ridge height of 8.0 m ).
