Frame synchronization in multicarrier transmission systems
US6912261B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 11, 2002 |
| Grant date | Jun 28, 2005 |
| Priority date | — |
| Expiry date | Feb 11, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2662
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A discrete multitone modulation transmission system is described in which frame synchronization is monitored at the receiver by correlating frequency domain complex amplitudes of a synchronizing frame with a stored synchronizing pattern. If the correlation result falls below a threshold, indicating a loss of frame synchronization, a plurality of correlations are performed, in each case using the stored complex amplitudes of the synchronizing frame multiplied by a respective complex value representing a respective complex derotation corresponding to a respective possible time shift of the synchronizing frame. The best correlation result, if it exceeds another threshold, indicates a time shift for restoring frame synchronization, this being possible before the next synchronizing frame is received.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.