Adaptive interference reduction system for crosstalk cancellatio

Telecommunications – Receiver or analog modulated signal frequency converter – Modulation distortion or cross talk correction or elimination

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324 57N, 333 18, 333166, 455 63, 375 58, 375101, 328167, H04B 110

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active

042209234

ABSTRACT:
An adaptive interference reduction system for removing cross talk from a dual polarization system comprising a first adjustable filter for varying the phase and the weight of a first input signal, a second adjustable filter for varying the phase and the weight of a second input signal, a first adder for adding this first input signal and the weighted and phase adjusted output from the second adjustable filter, a second adder for adding the second input signal and the weighted and phase adjusted output from the first adjustable filter, a first noise-to-signal measuring device for generating a signal proportional to the noise-to-signal ratio in the output signal from the first adder, a second noise-to-signal measuring device for generating a signal proportional to the noise-to-signal ratio in the output signal from the second adder, and a dither-type control logic for dithering in-phase and quadrature square-waves in accordance with the signals generated by the first and second noise-to-signal measuring devices to control the first and second adjustable filters. This system is further characterized in that the first and second noise-to-signal measuring devices comprise a slow response control circuit for maintaining the average value of the input signal from the adder at a reference value, and means for filtering this averaged value and detecting the power fluctuations remaining in the signal and generating a signal proportional to these fluctuations. Additionally, the first and second adjustable filters may be structured to have transfer functions across a predetermined bandwidth of W.sub.0 [1+W.sub.1 .omega.+W.sub.2 .omega..sup.2 ] or W.sub.0 [1+W.sub.1 .omega.+W.sub.2 .omega..sup.2 +W.sub.3 .omega..sup.3 ], where W.sub.0 , W.sub.1, W.sub.2 and W.sub.3 are signal weights and .omega. represents the frequency variation of the input signal from its carrier.

REFERENCES:
patent: 3735266 (1973-05-01), Amitay
patent: 3963990 (1976-06-01), DiFonzo
patent: 3986123 (1976-10-01), Tirro
patent: 4027105 (1977-05-01), Kannowade
patent: 4112370 (1978-09-01), Monsen
Cooper, C. P., "Methods of Adaptive Cancellation for Dual Polarization Satellite Systems," Marconi Review, vol. 39, No. 200, pp. 1-24, First Quarter 1976.
Kannowade, H., "An Automatic Control System for Compensating Cross-Polarization Coupling in Frequency Re-Use Communication Systems," IEEE Transactions on Communication, vol. COM-24, No. 9, pp. 986-999, Sep. 1976.

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