Isolation and analysis of the log-normal shadowing component at 1900 MHz

This paper investigates the correlation of lognormal shadow fading as a function of angle between two PCS base stations over urban, light urban and suburban terrain. Results from this study are relevant to calculating the effective interference and handoff gain and to various frequency planning applications. Using a much larger data set than previous experiments, we observed that on the average, the signals are effectively uncorrelated, even at small angles. Our results contradict the conventional wisdom as expressed in several papers. Analysis indicates that a mathematically simpler uncorrelated model for the relationship between signals from multiple base stations at small angles is valid. Auto correlation measurements on a large number of data sets showed that the correlation distance of lognormal shadowing ranges from about 25 to 100 meters