H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/47
H04B 7/005 (2006.01) H04B 7/00 (2006.01)
Patent
CA 1119255
CIRCUIT AND METHOD FOR REDUCING POLARIZATION CROSSTALK CAUSED BY RAINFALL BY SUITABLE MANIPULATION OF THE SIGNALS PRIOR TO TRANSMISSION Abstract of the Disclosure A circuit and a method are disclosed for reducing the effects of polarization crosstalk, at a remote location, when the polarization crosstalk is due to the interaction of two common frequency RF signals, caused by rainfall. This reduction in the polarization crosstalk is achieved by suitable manipulation of the signals prior to transmission. The present invention functions by applying circuitry, to the transmitter, for pre-distorting the two signals being transmitted by the transmitter circuitry. This pre- distortion is produced by introducing a controlled amount of coupling between the two signals. This amount of coupling is controlled in magnitude and phase so as to ideally be equal in magnitude to, but 180 degrees out of phase with, the polarization crosstalk introduced by the transmission medium. The ideal result is that the polarization crosstalk introduced during transmission of the signals is cancelled by the coupling introduced prior to transmission. In the preferred embodiment, the magnitude of an RF signal originating at the remote location and received at the transmit location is used as the basis for controlling the amount of coupling introduced between the two signals prior to transmission. As a general rule, the less the magnitude of the received signal, the greater is the polarization crosstalk, and the greater is the amount of coupling introduced between the two signals prior to transmission. It should be appreciated that this is only an approximate correction scheme and will seldom, if ever, produce perfect correction. - i -
322990
Lo Gerald J. P.
Shelton Anthony N.
Northern Telecom Limited
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