Cross-polarization crosstalk elimination circuit
US4466132A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 5, 1982 |
| Grant date | Aug 14, 1984 |
| Priority date | — |
| Expiry date | Apr 5, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/002
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
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 outp…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.