A mobile base station (BS) in an urban environment has a power measurement of 35 µW at 180 m. Assuming the propagation follows the inverse 4th power law (see Section 3.2.2), what is a reasonable power value in W, to assume at a distance of 540 m from the BS?
Power = k/distance4 where k is a constant.
Plug in the known values
35 = k/1804 so k = 35*1804
At 540m we have power = k/5404 = 35*1804/5404 = 35*(180/540)4 = 35*(1/3)4 = 35/81 = 0.432 µW