Digital receiver having adaptive carrier recovery circuit
US7342981B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 15, 2004 |
| Grant date | Mar 11, 2008 |
| Priority date | — |
| Expiry date | Dec 21, 2025 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0071
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A digital receiver, that may be used to receive VSB/QAM digital television signals, includes an adaptive fine carrier recovery circuit that compensates for deviations in the carrier frequency or phase. The carrier recovery circuit de-rotates a signal including phase errors. Estimations of phase errors are filtered using a filter whose gain and bandwidth are adjusted adaptively. This allows the carrier recovery circuit to track phase/frequency offset without introducing significant jitter. In one embodiment, the receiver includes a DFE, and the adaptive carrier recovery circuit mitigates instability that might be associated with the DFE.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.