Adaptive cross polarization Interference canceler for use at int

Details Adaptive cross polarization Interference canceler for use at int Adaptive cross polarization Interference canceler for use at int

1997-05-09

1999-05-04

Chin, Wellington

Telecommunications

Transmitter and receiver at separate stations

Distortion, noise, or other interference prevention,...

455307, 455304, 4552781, H04B 110

Patent

active

059013435

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.

REFERENCES:
patent: 3995271 (1976-11-01), Goggins, Jr.
patent: 5241320 (1993-08-01), Mizoguchi
patent: 5524125 (1996-06-01), Tsujimoto
patent: 5537443 (1996-07-01), Yoshino et al.
patent: 5710799 (1998-01-01), Kobayashi
patent: 5740208 (1998-04-01), Hulbert et al.

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