Centering multi-level data
US5148449A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 26, 1989 |
| Grant date | Sep 15, 1992 |
| Priority date | — |
| Expiry date | May 26, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/142
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
There is provided a scheme for centering data prior to detection. It comprises: determining carrier frequency error, and pre-adjusting the data detection process to compensate for that error throughout the ensuing data detection. This scheme for reliable multi-level data detection further comprises: upon detection of carrier presence, determining carrier frequency error, gating a voltage associated with the frequency error to the differential amplification process to establish common mode rejection and compensating for that error throughout the ensuing multi-level data detection, and then analog-to-digital conversion of the differentially amplified multi-level data. A scheme for computationally centering the subsequent data detected to compensate for the error is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.