Apparatus for and method of far-end crosstalk (FEXT) detection and estimation
US7778314B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 4, 2006 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Jun 17, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03057
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A novel and useful mechanism for the detection and estimation of far-end cross talk (FEXT) caused by transmissions over adjacent wire pairs or cables. The detection and estimation technique of the invention can be used to identify FET impairments in Ethernet and DSL systems. The detection and estimation scheme is performed utilizing an adaptive FEXT canceller filter for detection purposes during normal operation of the system. FEXT filter tap coefficients are determined one at a time using a mechanism shared amongst all taps. Once adapted, the filter coefficients can be used to estimate FEXT strength and to determine spectral measurements of the FEXT impairment noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.