Method for refining a DC-offset estimate and removing the DC-offset
US6947496B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Sep 25, 2001 |
| Grant date | Sep 20, 2005 |
| Priority date | — |
| Expiry date | Jul 25, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/06
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for refining a DC-Offset estimate and removing of the DC-Offset includes the step of determining if any AM is present (602). If AM is determined to be present, it is next determined if the I and Q path DC-Offset estimates are closely matched, if they are, then only a single search using the average of the I and Q path estimates is used (608). If it determined however, that the two path estimates are not closely matched, than two searches are performed, one for each path (610). After this, the blocking signals are searched for up to a predetermined number and the DC-Offset vector is generated (612). Once the DC-Offset vector is generated, the DC-Offset is removed from the received signal (614). After which it is determined if the AM level is high (616), and if so, a transient correction routine is performed (618).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.