Method, mobile station and base station for frequency synchronization of a mobile station in a radio communications system
US6577615B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 16, 1999 |
| Grant date | Jun 10, 2003 |
| Priority date | — |
| Expiry date | Dec 16, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W92/10
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A TDMA/CDMA radio communications system provides frequency channels which are formed both by time slots and by broadband frequency ranges, and in which information from a plurality of connections can be simultaneously transmitted between mobile stations and a base station wherein it is possible to distinguish the information from different connections in accordance with a connection-specific fine structure. Frequency channels are repeatedly provided for frequency synchronization of the mobile stations in the downward direction in which a symbol sequence is transmitted. From received signals, the mobile station to be synchronized determines estimated values for the symbol sequence and compares these estimated values with a reference sequence. It is thereby possible to calculate a phase drift in the estimated values with reference to the reference sequence wherein a frequency offset, which is used for frequency synchronization, is determined from the phase drift.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.