Echo-canceler for precoded fractionally spaced receiver using signal estimator
US6996230B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 13, 2003 |
| Grant date | Feb 7, 2006 |
| Priority date | — |
| Expiry date | Dec 20, 2023 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B3/23
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
An echo canceler for a fractionally spaced telecommunication receiver employs a signal estimator, which generates a fractionally spaced representation of a received information signal that has been subjected to Tomlinson preceding. The output of the signal estimator is differentially combined with fractionally spaced outputs of the echo canceller, so as to effectively remove the contribution of the received information signal from the echo cancellation update operation. As a result, the echo update signal will consist primarily of the residual echo and the noise from the wireline/loop. The error signal can be used at the fractional spacing rate to update all of the echo canceler coefficients, largely without interference from the much larger received information signal. This allows a higher echo canceler gain than that currently incorporated into HDSL2 echo canceler updates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.