Cross-polarization interference cancellation system capable of s

Details Cross-polarization interference cancellation system capable of s Cross-polarization interference cancellation system capable of s

1990-07-27

1991-06-11

Blum, Theodore M.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including polarized signal communication transmitter or...

375102, H01Q 2106, H01Q 2124

Patent

active

050236202

ABSTRACT:
In a cross-polarization interference cancellation system operable in response to desired and undesired or interference source signals which are obtained from polarized waves having planes of polarization orthogonal to each other and which are produced in accordance with clock signals having a predetermined clock frequency, an interference signal is included in the desired signal and is derived from the interference source signal to be removed from the desired signal by the use of an interference canceller and to be produced as an interference free signal. The interference free signal is demodulated into demodulated signals, error signals, and quadrant detection signals by a demodulator unit. In this event, the quadrant detection signals alone are stably demodulated by the use of specific clock signals which are sent through a frequency doubler operable to double the predetermined clock frequency of the clock signals. The interference canceller comprises a transversal filter and a control signal generator for supplying the transversal filter with control signals stably produced by the control signal generator. As a result, the interference canceller is stably operated in response to the control signals.

REFERENCES:
patent: 4575862 (1986-03-01), Tahara et al.
patent: 4757319 (1988-07-01), Lankl

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