Adapting filter to detected interference level
US7791515B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 24, 2005 |
| Grant date | Sep 7, 2010 |
| Priority date | — |
| Expiry date | Feb 12, 2027 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/1027
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A receiver uses a sigma delta ADC (126) and an adaptable digital filter (132). Detector circuitry detects information about unwanted parts of the signal from an oversampled digital signal, before the filtering, and feeds forward the detected information to the filter, to adapt the filter. By feeding forward the detection information, rather than feeding back an output of the filter, the adaptation can respond much more quickly to rapid changes in the unwanted interference. This enables reduced filtering to save power when interference is low, without risking a sudden increase in interference causing an avalanche of errors before the filter can be adapted correctly. The filter receives the oversampled digital signal combines decimation and channel filtering in one stage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.