The cross polarization discrimination OF MIMO antennas at mobile station

A general formula for the cross polarization discrimination (XPD) of multiple input multiple output antennas at mobile station is provided, taken the influence of mobile antenna inclination into account. A statistical distribution indoor model for both vertically polarized and horizontally polarized incident waves that are uniform in elevation and in azimuth is also proposed. By using the formula jointly with this statistical model, the effect of some parameters on XPD is analyzed numerically. The obtained XPD values vary from approximately 5 dB to less than 11 dB. These values are consistent with the measurement, which are typically used in system specifications. For antennas inclination, deviation angle has little effect on the XPD, but clear differences exist between antennas.