Frequency offset correction based on the presence or absence of a received signal
US7711338B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 5, 2001 |
| Grant date | May 4, 2010 |
| Priority date | — |
| Expiry date | Dec 10, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L2027/0071
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
The present invention relates to a method for controlling a frequency in a receiver, in particular in a receiver used in a telecommunications system. To keep precise clock frequency even when the synchronization signal from base-station is missing the method comprises the steps of: determining a change of an internal reference oscillator frequency relative to the frequency of the received signal from a transmitting station, determining a frequency control value for controlling the internal reference oscillator frequency, storing at least one value indicating the change of the internal reference oscillator frequency, and controlling the internal reference oscillator frequency in accordance with the frequency control value, that has been determined either in accordance with the change of the internal reference oscillator frequency relative to the frequency of the received signal in case that the signal from the transmitting station has been received (S20), or in accordance with the stored value(s) indicating the change of the internal reference oscillator frequency in case that the received signal has been missed (S30).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.