Decorrelation Distance Characterization of Long Term Fading of CW MIMO Channels in Urban Multicell Environment

An analysis of long-term fading properties of 4times4 CW MIMO channels is presented in this paper. The main focus has been on the long-term variability of MIMO channels in urban cellular environments, with emphasis on the decorrelation distance over mid range distances along the mobile trajectory for different base station antenna heights. A model that characterizes the decorrelation distance at different probability levels of distribution of the decorrelation distance is proposed. The model predicts that at some probability level all measured decorrelation distances will be within 1/2Deltax₀ and 2Deltax₀, where Deltax₀ is the decorrelation distance at the e^-1 level of the autocorrelation function