XPD, Cross Polarization Discrimination, in wave transmission: ratio of the co-polarized average received power to the cross-polarized average received power.
XPI, if you feed in H, the received V vs. Input H.
XPD, Cross Polarization Discrimination, in wave transmission: ratio of the co-polarized average received power to the cross-polarized average received power.
XPI, if you feed in H, the received V vs. Input H.