Simultaneous characterization of polarization matrix components in pico cells

This paper describes a simultaneous sounding technique for polarization matrix investigations in pico cell environments at 1890 MHz. The measurement technique is based on two transmitting signals (separated by an artificial Doppler shift of 20 Hz), and a dual branch correlation sounder allowing the simultaneous sounding of four individual diversity branches. Dual polarized antennas with nearly identical radiation patterns for both polarization ports are used. The investigations of the polarization matrix are conducted in terms of cross-polarization discrimination (XPD) and correlation coefficients. The effect of different XPD's for the horizontal and the vertical polarization is mainly caused by the suppression of the horizontal co-polarized components in the propagation environment.