System and method for fast channel switching in a satellite receiver
US5995563A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 10, 1997 |
| Grant date | Nov 30, 1999 |
| Priority date | — |
| Expiry date | Feb 10, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03J7/04
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A DBS receiver front end which converts the received signal directly to the baseband representation and maintains a high performance with a new techniques for tracking and counteracting frequency drift and I/Q angular error. The DBS receiver front end comprises a tuner and a demodulator/decoder. The tuner receives a high frequency signal and converts it to a baseband signal having a frequency offset error. In one embodiment, the DBS receiver front end includes a demodulator/decoder which preserves frequency offset error tracking through a channel change. The demodulator/decoder receives the baseband signal and produces a compensation signal for canceling the frequency offset error. This is done using an element which generates a value indicative of the frequency offset error. Since the frequency offset error is independent of the selected channel, freezing the value indicative of the frequency offset error during a channel change enables a much faster acquisition of timing. In this manner faster channel acquisition is obtained.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.