Joint equalization and timing acquisition for RZ signals
US7023941B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 11, 2003 |
| Grant date | Apr 4, 2006 |
| Priority date | — |
| Expiry date | Oct 22, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03471
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An apparatus and method for jointly equalizing a return to zero (RZ) signal and detecting timing errors in the RZ signal, using values or indices from equalizer taps, including a set reference tap that does not shift. A timing error detector detects a timing error based on a group delay measured from the equalizer tap information, and then adjustment circuitry modifies samples of the received RZ signal prior to their equalization to offset that timing error. Methods of modifying the samples to offset the timing error include adjusting the timing of the sampler, or adjusting the sampled data using intermediate, interpolated samples generated by a timing interpolation filter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.