p is normalized power

r is normalized distance

Free Space Loss: "20 log d" models

p = r ^-2

Groun wave propagation: "40 log d" models

p = r ^-4

Emperical model:

p = r ^-b,

b + 2 ... 5

b + 3.2

Piece-wise 'linear' models: Harley

JPL's Wireless Communication Reference Website © Jean-Paul M.G. Linnartz, 1993, 1995.