Partial equalization for digital communication systems
US6512789B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 1999 |
| Grant date | Jan 28, 2003 |
| Priority date | — |
| Expiry date | Apr 30, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03522
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A training process for a filter such as included in a time domain equalizer for an xDSL transceiver includes a novel spectral estimation process for a channel. The spectral estimation determines the taps of the filter using an overdetermined set of equations based on the auto-correlation estimates of the received signal. A weighting function such as a sigmoidal function is applied to the AC coefficients to change the relative weighting of the AC coefficients. Upon solving for the taps of the filter using a fitting criterion such as the least square error criterion, the filter significantly reduces the impulse response of the channel.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.