Method for self-training adaptive equalization
US5319674A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1991 |
| Grant date | Jun 7, 1994 |
| Priority date | — |
| Expiry date | Oct 22, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L25/0305
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method is disclosed for adapting, in a self-training procedure, an equalizer based on distributed-arithmetic design. In such an equalizer, in each modulation interval addresses are derived from stored received signal samples x.sub.n.sup.q to choose some of the values stored in a look-up table. The chosen table values are combined by shift-and-add operations to obtain an equalizer output value y.sub.n. According to the novel adaptation scheme, only one of the chosen look-up table values is selected per modulation interval, for updating it in a particular fashion to reduce the error detected. The disclosed scheme ensures uniform selection of the stored look-up table values for updating. Only one additional shift-and-add operation is required per modulation interval to achieve satisfactory adaptation of the equalizer. No training sequence is required to be transmitted, and the scheme converges in all situations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.