Apparatus and method thereof for compensating for gain changes of N-PAM modulate signals
US8837573B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 17, 2011 |
| Grant date | Sep 16, 2014 |
| Priority date | — |
| Expiry date | Nov 2, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2025/03363
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A method for compensating for gain changes of an N-level pulse amplitude modulation (PAM-N) modulated signal. The method comprises comparing the PAM-N modulated signal to N−1 configurable thresholds, wherein the input PAM-N modulated signal is also equalized and the N−1 configurable thresholds are N−1 different voltage levels; tracking gain changes in the input PAM-N modulated signal by comparing the input PAM-N modulated signal to a compensation threshold; and adjusting a level of the at least one of the N−1 configurable thresholds of the N−1 comparators based on an output of the compensation comparator, thereby offsetting a crossing point of the at least one comparator respective of the at least one of the N−1 configurable thresholds to compensate for gain changes in the input PAM-N modulated signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.