Multi-mode variable rate digital satellite receiver
US6714608B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 27, 1998 |
| Grant date | Mar 30, 2004 |
| Priority date | — |
| Expiry date | Apr 25, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0057
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
Carrier signals are modulated by information (e.g., television) signals in a particular frequency range. The information signals are oversampled at a first frequency greater than any of the frequencies in the particular frequency range to provide digital signals at a second frequency. The digital signals are introduced to a carrier recovery loop which provides a feedback to regulate the frequency of the digital signals at the second frequency. The digital signals are introduced to a symbol recovery loop which provides a feedback to maintain the time for the production of the digital signals in the middle of the data signals. The gain of the digital signals is also regulated in a feedback loop. The digital signals are processed to recover the data in the data signals. By providing digital feedbacks, the information recovered from the digital signals can be quite precise. In one embodiment, the carrier signals are demodulated to produce baseband inphase and quadrature signals. The inphase and quadrature signals are then oversampled and regulated in the feedback loops as described above. In a second embodiment, the carrier signals downconverted to produce intermediate frequency signal…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.