Timing recovery for DMT-based DSL modems
US6643343B1 · kind B1 · utility
2Cited by
12References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 21, 2000 |
| Grant date | Nov 4, 2003 |
| Priority date | — |
| Expiry date | Nov 12, 2021 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2657
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
In an arrangement where an incoming QPSK signal contains a PRN every N frames, oscillator synchronization is achieved via control signals that are developed from the PRN frame by rotating the vectors derived from demodulated received signal, applying a complex tracking filter to the results, averaging the results, performing phase accumulation, and developing an analog voltage to be applied to a voltage controlled oscillator through D/A conversion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.