H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/227 (2006.01) H04L 7/04 (2006.01)
Patent
CA 2298797
According to the invention, during synchronization a first analog carrier signal (bs) has at least temporarily a predetermined phase angle. A further reference carrier signal (rs) is modulated with the same predetermined phase angle, the phase difference of the two modulated carrier signals (bs, rs) is determined and the phase angle of the reference carrier signal (rs) is corrected by the phase difference that has been determined. In this way the phase difference can be determined and corrected very rapidly. The method provided for in the invention is used to advantage in the demodulation of carrier signals (bs) having high data rates, especially those emitted in bursts.
Selon l'invention, pendant la synchronisation, un premier signal porteur analogique (bs) présente, au moins de façon temporaire, un angle de phase prédéterminé. Un autre signal porteur de référence (rs) est modulé avec le même angle de phase prédéterminé, la différence de phase entre les deux signaux porteurs modulés (bs, ts) est déterminée, puis l'angle de phase du signal porteur de référence (rs) est corrigé de la différence de phase déterminée. Il est ainsi possible de déterminer et de corriger très rapidement la différence de phase. Le procédé de l'invention peut être mis en oeuvre de façon avantageuse lors de la démodulation de signaux porteurs (bs) émis avec un débit binaire élevé, notamment sous forme de salves.
Aktiengesellschaft Siemens
Fetherstonhaugh & Co.
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