Patent · US Expired

Apparatus and method for generating a reference frequency

US6754296B2 · kind B2 · utility

1Cited by

3References

39Claims

0Family size

Assignee

Societe Europeenne des Satellites S.A. · LU

Inventors

Detlef Schulz · Hamburg, DE
Gerhard Bethscheider · Ayl, DE
Peter Siebert · Wasserliesch, DE

Key dates

Filing date	Aug 8, 2001
Grant date	Jun 22, 2004
Priority date	—
Expiry date	Aug 8, 2021

Classification

Technology area (CPC H)Electricity
CPC primaryH04B7/185
WIPO fieldTelecommunications
WIPO sectorElectrical engineering

Abstract

The invention refers to an apparatus for generating a reference frequency depending on a timing information extracted from a data stream. In order to generate a carrier frequency in a user station of a satellite TDMA network at low costs which is accurate and stable and which meets stringent phase noise requirements, it is suggested to use at least one free-running oscillator. The frequency deviation with regard to the timing information extracted from the data stream is estimated by an estimation means. At least two oscillation signals are derived from the at least one oscillation means and are linked together by a linking means yielding said reference frequency. A frequency correction value is applied to at least one of the oscillation signals such that the timing information given by the reference frequency corresponds to the timing information extracted from said data stream.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.