Method of detection of misconvergence using constellation scanning in an equalizer
US6246722A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Apr 29, 1998 |
| Grant date | Jun 12, 2001 |
| Priority date | — |
| Expiry date | Apr 29, 2018 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/037
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method of detecting misconvergence in an equalizer having a quadrature amplitude modulation (QAM) slicer having an index n. The method includes the steps of initializing a plurality of signal counters then processing random symbols (for example between 500 and 20000 symbols) through the equalizer where the symbols are quantized into an appropriate constellation point in an n-QAM constellation map, where each signal counter corresponds to a respective one of the constellation points in the constellation map. The signal counters are incremented when one of the symbols is quantized to the corresponding constellation point. After the signals have been processed into the constellation map the number of non-zero counters are detected. If the number of non-zero counters is less than a prescribed number (for example between approximately 0.5n and approximately 0.9n), then the equalizer has not converged and if the number of non-zero counters is equal to or greater than the prescribed number than the equalizer has converged.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.