XPICCross Polarization Interference Cancellation,cross polarization discrimination xpd calculations.



XPIC, or crosspolarization interference cancelling technology, is an algorithm to suppress mutual interference between two received streams in a Polarizationdivision multiplexing communication system.

The crosspolarization interference canceller (known as XPIC) is a signal processing technique implemented on the demodulated received signals at the baseband level. It is typically necessary in Polarization Division Multiplexing systems: the data sources to be transmitted are coded and mapped into QAM modulating symbols at the system's symbol rate and upconverted to a carrier frequency, generating two radio streams radiated by a single dualpolarized antenna (see feed pattern of Parabolic antenna). A corresponding dualpolarized antenna is located at the remote site and connected to two receivers, which downconvert the radio streams into baseband signals (BB H, BB V).

This multiplexing/demultiplexing technique is based on the expected discrimination between the two orthogonal polarizations (XPD):

an ideal, infinite XPD of the whole system guarantees that each signal at the receivers contains only the signal generated by the corresponding transmitter (plus any thermal noise);
any real, finite, level of XPD instead manifests itself as a partial recombination between the two signals, so that the receivers observe an interference due to the crosspolarization leakage. Some of the factors causing such crosspolarization interference are listed in PolarizationDivision Multiplexing.























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