Apparatus and method for receiving bs digital broadcast

H - Electricity – 04 – L

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Details

H04L 27/22 (2006.01) H04L 27/00 (2006.01) H04L 27/227 (2006.01)

Patent

CA 2379621

- 29 - An improved apparatus for receiving BS digital broadcast is disclosed. The apparatus for receiving BS digital broadcast of the present invention has first to third filters and a selective complex calculator circuit. Each of the first to third filters 18 to 20 identifies the modulation technique applied to the received signal, by the modulation identification signals A0, Al received from a timing generator circuit 25, and filters a phase error signal PED according to the identified modulation technique. The selective complex calculator circuit 21 shifts the phase of a signal point indicated by an I signal ADI1 and a Q signal ADQ1 absolute-phased by an absolute-phasing section 14, by a phase corresponding to the phase error signal filtered by the first to third filters 18 to 20. At this moment, the selective complex calculator circuit 21 selects the phase error signal corresponding to the modulation technique identified from the modulation identification signals A0, Al received from the timing generator circuit 25. Consequently, in the burst receiving, it is possible to reduce the effect on the error rate because of the signal noise of the ODU to a degree equal to that in the continuous receiving.

L'invention concerne un dispositif amélioré de réception de diffusion numérique BS, qui comporte un premier, un deuxième et un troisième filtre et un circuit d'exploitation sélectif complexe. Les filtres (18-20) sont conçus pour spécifier un procédé de modulation appliqué au signal reçu, des signaux d'identification de modulation (A0, A1) étant respectivement reçus d'un circuit de génération de synchronisation (25), et pour filtrer un signal d'erreur de phase (PED) conformément au procédé de modulation spécifié. Un circuit d'exploitation sélectif complexe (21) décale les phases de points de signaux indiqués par les signaux I et Q (ADI1, ADQ1), les phases desquels sont rendus absolus par une section de production de phase absolue (14) selon des quantités correspondant aux signaux d'erreur de phase filtrés par les filtres (18-20). Le circuit d'exploitation sélectif complexe (21) sélectionne le signal d'erreur de phase qui correspond au procédé de modulation spécifié à partir des signaux d'identification de modulation (A0 et A1) reçus du circuit de génération de synchronisation (25). Lors de la réception de rafales, par conséquent, l'influence du bruit des signaux de l'ODU sur le taux d'erreur peut être abaissé à celui de la réception continue.

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