The optimized polarization for indoor MIMO based on cross polarization loss and near earth loss

As has been shown by our testing, the propagation loss (PL) of vertically-polarized (VP) transmitting and horizontally-polarized (HP) receiving is larger than that of VP transmitting and VP receiving, i.e. the cross polarization loss exists. At wireless covered indoor situation, the PL of HP waves is different with that of VP waves, and the difference is traditionally described as near-earth loss. Consider the cross-polarization loss and near earth loss, a 2×2 orthogonal dual-polarization MIMO system has a total receiving power irrelevant of the polarized angle settings, but the balance of the receiving power is dependent on the angle settings. When the receiving setting is +45°/-45° dual-polarization, the two antennas receive equal power, which reaches equilibrium.