System and method for adjusting a non-return to zero data stream input threshold
US7107499B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 15, 2002 |
| Grant date | Sep 12, 2006 |
| Priority date | — |
| Expiry date | Apr 10, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B20/10009
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A state machine method and system are provided for determining non-causal channel equalization thresholds. The method comprises: receiving a non-return to zero (NRZ) data stream encoded with forward error correction (FEC); setting x=0; in State 0, adjusting a third threshold (Vopt) in response to corrected bit errors; if x=0, setting a first and second threshold equal to the third threshold; in State 1, if x=0, simultaneously adjusting the first threshold and the second threshold, to minimize the total number of corrected bit errors; in State 2, following State 0, adjusting the first threshold, independent of the second threshold, to minimize the total number of errors; in State 3, following State 0, adjusting the second threshold, independent of the first threshold, to minimize the total number of errors; and, adding 1 to x and returning to State 0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.