Adaptive precoding system and method for equalizing communication signal
US6243425A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 12, 1998 |
| Grant date | Jun 5, 2001 |
| Priority date | — |
| Expiry date | Jan 12, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/03057
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An adaptive preceding system is implemented within a data communications system in order to precode data to track changes in a communications channel. The adaptive precoding system initializes a set of precoder values within a precoder filter of a transmitter during an initialization phase. The precoder filter is used to create a precoding signal that is combined with a transmission data signal in order to compensate for distortions on a communications channel. During a communications phase, a decision feedback equalizer generates equalizer coefficients that correspond to changes on the communications channel. The equalizer coefficients are periodically transmitted to a converter within the transmitter over a secondary channel. The converter determines a new set of precoder values that compensate for the changes in the communications channel and slowly updates the values in the precoder filter until they match the new set of precoder values. While the precoder values are being updated, the decision feedback equalizer updates the equalizer coefficient values to reflect the improvements realized by updating the precoder values.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.