Synchronization and sampling frequency in an apparatus receiving OFDM modulated transmissions
US6125124A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Sep 16, 1997 |
| Grant date | Sep 26, 2000 |
| Priority date | — |
| Expiry date | Sep 16, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/2605
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An OFDM receiver determines (12; 27) the pulse response of a radio channel and locates (13; 14) its starting point, end point and the maximum and its value. The difference between the end point and the starting point gives the length of the pulse response. A guard interval time corresponding to the guard interval separating the OFDM symbols is set (17; 18) in the receiver in such a manner that it covers the most significant components of the pulse response. A slow and monotonous temporal shift of the pulse response between measurement rounds indicates an error in the sampling frequency. The error is corrected (23; 31) in such a manner that the pulse response shift is compensated for.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.