Dual polarization demodulation with cross polarization cancellat

Details Dual polarization demodulation with cross polarization cancellat Dual polarization demodulation with cross polarization cancellat

1989-02-15

1990-03-20

Grimm, Siegfried H.

Demodulators

Frequency modulation demodulator

Plural demodulation

329320, 375102, 455295, 455306, H04B 112

Patent

active

049104683

ABSTRACT:
In a digital demodulation system (FIGS. 2, 3, 4, 7, 8) in a dual polarization radio system, having a first demodulator (4) and a first A/D converter (14) for a main signal, a second demodulator (5) and a second A/D converter (15c) for an interference signal (cross polarization signal), a transversal filter (18) for providing a compensation signal for cancelling an interference component in the main signal depending upon the demodulated interference component; the second A/D converter (15c) for providing the interference component in digital form is operated with a clock signal (102) regenerated in the main signal branch (4, 14) so that system operates correctly even when the main signal and cross polarization signal are in an asynchronous condition. The A/D converter (14, 15c, 105) is provided with an attenuator (104) for compressing amplitude of an input signal to avoid saturation of the circuit (105) in case of fading and/or distortion, and a ROM table (107) for correcting digitalized output after equalization and/or cancellation. Tap coefficients of the transversal filter (18) are obtained by a control (19) through a ZF method when inter-symbol interference is small, and a MLE method when inter-symbol interference is large. Further, an integration constant for the coefficients is adaptive depending upon inter-symbol interference.

REFERENCES:
patent: 4575862 (1986-03-01), Tahara et al.
patent: 4577330 (1986-03-01), Kavehrad
patent: 4606054 (1986-08-01), Amitay et al.
patent: 4688235 (1987-08-01), Tahara et al.

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