Telecommunications – Receiver or analog modulated signal frequency converter – Modulation distortion or cross talk correction or elimination
Patent
1982-04-05
1984-08-14
Bookbinder, Marc E.
Telecommunications
Receiver or analog modulated signal frequency converter
Modulation distortion or cross talk correction or elimination
343362, 455 60, 455 63, H04B 112
Patent
active
044661320
ABSTRACT:
A digital transmission system is provided based on a cross-polarization band-sharing technique using a conventional antenna system which does not have a sufficient cross-polarization discrimination.
An interference elimination circuit receives two mutually orthogonal cross-polarized waves and restores to at least one of the received cross-polarized signals, a baseband signal which is free of cross-polarization interference attributable to orthogonal cross-polarization crosstalk components. This circuit includes an orthogonal cross-polarization, crosstalk component adder having a weighting circuit for multiplying an interference component of the received orthogonal cross-polarized signals by a compensation coefficient. A compensating adder adds the output of the weighting circuit to a desired one of the received cross-polarized signals. An error detector detects the difference between a transmitted signal and the desired one of said received signals on the basis of the output of said cross-polarization crosstalk component adder. An oscillator generates cyclic infinitesimal signals which a correlator uses for detecting any correlation between the output of the oscillator and the output of the error detector. An integrator integrates the output of said correlator. A control unit adds the output of the integrator to the output of the oscillator and supplies the resulting sum as the compensation coefficient for the weighting circuit of the orthogonal cross-polarization component adder.
REFERENCES:
patent: 3646448 (1972-02-01), Harmon, Jr. et al.
patent: 4146893 (1979-03-01), Inagaki et al.
patent: 4220923 (1980-09-01), Pelchat et al.
patent: 4283795 (1981-08-01), Steinberger
"New Automatic Polarization Cancelling Control for Multiple Station Satellite Communication Systems", International Conf. on Communications, Toronto, Canada, Jun. 4-7, 1978, IEEE Catalog No. 78CH1350-8 CSCB, vol. 3.
Bookbinder Marc E.
Nippon Electric Co. Ltd.
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