Method and apparatus for echo cancellation updates in a multicarrier transceiver system
US6781965B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 5, 2000 |
| Grant date | Aug 24, 2004 |
| Priority date | — |
| Expiry date | Apr 5, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2647
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A simple fast and robust echo canceller for both synchronous and asynchronous multicarrier transceiver systems. A first residual time domain echo component is separated from a receive signal in a first frame and a second residual time domain echo component is separated from a receive signal in the next consecutive frame. The first and second residual time domain echo components from consecutive frames are combined to obtain a combined residual time domain echo component. The combined residual time domain echo component is used to adaptively update coefficients in a transfer function representing an estimate of the echo channel in the multicarrier transceiver system. The separation of the echo components from the receive signal eliminates dependence on the receive signal so that convergence is substantially faster and not signal dependent. Performance of the echo canceller is virtually independent of the receive signal and allows reliable tracking of changes in the echo channel over time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.