Questions concerning MIMO polarization techniques ?

Salam alikom all

h r u? I hope u r all fine

well, I just want to know what is the difference between cross-polarization discrimination (XPD), and the polarization parallelity?

as both - as I think so - concerns with that how much different polarizations such as the V polarization and H polarization will interfere together or how much one of them will leak into the other, thus I don't understand what the difference between them

I am saying that, because I am interested in MIMO using polarization techniques, and thus the TX itself can have 2 antennas of V and H polarizations, and so..

can anyone help me please

thanks in advance,


salam alikom