Local mean signal variability in rural areas at 900 MHz

Analysis of mobile radio propagation results from surveys made in rural areas of England have shown that over different distances, the local mean of the signal envelope is well described by a lognormal distribution. This analysis has provided a knowledge of the standard deviation of the lognormal distribution, σ_L, as a function of the size of area under consideration. It has also shown categorically that σ_L is independent of path length. Large amounts of data were collected along several survey routes, so that the parameters of a local mean fading simulator could be determined. The power spectral density of the local mean signal measured along rural routes is estimated. The relative spectral density of the local mean signal variations is found to be always less than -10 dB for frequencies greater than f_D/360