Cross Polarization Discrimination of MIMO Antenna Configurations

The cross polarization discrimination (XPD) of multiple input multiple output (MIMO) array antenna at a mobile station in indoor propagation environments is studied. The novel closed-form expressions for cross polarization discrimination of angular spread, mean angle of arrival (AOA) and scatterer numbers are presented. It provides a deep understanding of the cross polarization system for different indoor environments and takes into account both azimuth and elevation spectrum. Furthermore, XPD values depend highly on the propagation path between the base station (BS) and mobile station (MS) due to line of sight (LOS) and nonline of sight (NLOS) situation. Finally, we consider antenna inclination at MS, which impact on MIMO array antenna performance because it results in receiving power difference.