Discussion
What does a cross polar interference canceller do?
Answer: D
Because the interference is a known signal, being the other channel, an adaptive circuit can estimate the leakage and subtract it, restoring twenty decibels or more of discrimination during rain. It is the same principle as an echo canceller. Mechanical rotation is far too slow, falling back to one polarisation halves the capacity, and raising power raises the leakage too. Cancelling a known interferer rather than merely tolerating it is possible whenever the interferer is available as a reference.
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