Adaptive cross polarization Interference canceler for use at intermediate frequencies
First Claim
1. An intermediate frequency adaptive cross polarization interference canceler comprising:
- right and left inputs for respectively receiving right and left polarized IF input signals;
a plurality of serially coupled complex multiplier and control stages that each provide controlled and predetermined amounts of coupling between the right and left polarized signals to cancel cross polarization interference therebetween;
a plurality of delay lines respectively coupled between the plurality of serially coupled complex multiplier and control stages that provide predetermined time shifts between the right and left polarized signals, and which comprise a transversal filter having a predetermined number of taps; and
right and left polarized outputs for outputting right polarized IF output signal and a left polarized IF output signal having substantially no cross polarization interference therebetween.
4 Assignments
0 Petitions
Accused Products
Abstract
An intermediate frequency adaptive cross polarization interference canceler for processing an interfering cross polarization signal distorted by dispersion. The canceler has right and left inputs for respectively receiving right and left polarized IF input signals. A plurality of serially coupled complex multiplier and control stages respectively process the right and left polarized signals to provide controlled amounts of coupling between them to cancel cross polarization interference therebetween. A plurality of delay lines add predetermined time shifts to the right and left polarized signals between stages, and which forms a transversal filter having a predetermined number of taps. The canceler outputs right polarized IF output signal and a left polarized IF output signal having substantially no cross polarization interference therebetween. A preferred embodiment of the adaptive cross polarization interference canceler uses a compensating five-tap transversal filter disposed in the cancellation path. A simplified single tap adaptive cross polarization interference canceler may be used if there is no dispersion.
-
Citations
16 Claims
-
1. An intermediate frequency adaptive cross polarization interference canceler comprising:
-
right and left inputs for respectively receiving right and left polarized IF input signals; a plurality of serially coupled complex multiplier and control stages that each provide controlled and predetermined amounts of coupling between the right and left polarized signals to cancel cross polarization interference therebetween; a plurality of delay lines respectively coupled between the plurality of serially coupled complex multiplier and control stages that provide predetermined time shifts between the right and left polarized signals, and which comprise a transversal filter having a predetermined number of taps; and right and left polarized outputs for outputting right polarized IF output signal and a left polarized IF output signal having substantially no cross polarization interference therebetween. - View Dependent Claims (2, 3, 4, 5, 6)
-
-
7. An intermediate frequency adaptive cross polarization interference canceler comprising:
-
right and left inputs for respectively receiving right and left polarized IF input signals; five serially coupled complex multiplier and control stages that each provide controlled and predetermined amounts of coupling between the right and left polarized signals to cancel cross polarization interference therebetween; a plurality of delay lines respectively coupled between the plurality of serially coupled complex multiplier and control stages that provide predetermined time shifts between the right and left polarized signals, and which comprise a five tap transversal filter having a predetermined number of taps; and right and left polarized outputs for outputting right polarized IF output signal and a left polarized IF output signal having substantially no cross polarization interference therebetween. - View Dependent Claims (8, 9, 10, 11)
-
-
12. An intermediate frequency adaptive cross polarization interference canceler comprising:
-
right and left inputs for respectively receiving right and left polarized IF input signals; five serially coupled complex multiplier and control stages that each provide controlled and predetermined amounts of coupling between the right and left polarized signals to cancel cross polarization interference therebetween; a plurality of delay lines respectively coupled between the plurality of serially coupled complex multiplier and control stages that provide predetermined time shifts between the right and left polarized signals, and which comprise a five tap transversal filter having a predetermined number of taps; and right and left polarized outputs for outputting right polarized IF output signal and a left polarized IF output signal having substantially no cross polarization interference therebetween; and wherein the left polarized signal is in step with the right polarized signal in the first control stage, the left polarized signal is Δ
τ
ahead of the right polarized signal in the second control stage, the left polarized signal is 2Δ
τ
ahead of the right polarized signal in the third control stage, the left polarized signal is Δ
τ
behind the right polarized signal in the fourth control stage, and the left polarized signal is 2Δ
τ
behind the right polarized signal in the fifth control stage. - View Dependent Claims (13, 14, 15, 16)
-
Specification