Method and devices for transmitting data, particularly by satellite
US5428600A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 18, 1994 |
| Grant date | Jun 27, 1995 |
| Priority date | — |
| Expiry date | Jan 18, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B7/18532
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A relay satellite receives, from stations on the ground, modulated high-frequency signals situated in two different frequency bands. One of the modulations is narrow band and the other broad band. The satellite retransmits a multiplexed signal resulting from the phase modulation, of a sub-carrier consisting of the signal modulated by the narrow band modulation. The phase modulation is performed using signals drawn from the signals that carry the broad-band modulation. The user stations receive this multiplexed signal and extract therefrom, by filtering, the narrow band modulated sub-carrier, which can be used for phase-demodulating the multiplexed signal in order to recover signals which carry the broad-band modulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.