Empirical analysis of the correlation of MIMO channels in indoor scenarios at 2 GHz

An experimental analysis is given of the spatial correlation between MIMO subchannels in indoor scenarios, analysing the various factors which affect the correlation, such as the type of scenario, presence or not of line of sight and the relative orientation between the transmitter and receiver array. The results show a great variability in the correlation coefficient as a function of the distance between the elements in the receiver array. They also show that the correlation coefficient for the same distance between elements in the array changes in response to different relative positions and orientations between the transmitter and receiver arrays. Thus a statistical characterisation of the correlation coefficient is required. High values are obtained for the correlation between various subchannels, even for separations between receiving elements greater than 0.5 λ.