H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 27/20 (2006.01) H03G 3/30 (2006.01)
Patent
CA 2201408
A transmission apparatus using the modulation system in which an envelope is reduced to zero at a moment on the way of transmission includes a mapping circuit for mapping a transmission signal in the signal point arrangement, D/A converters for converting signals for I and Q channels obtained by the mapping circuit into respective analog signals, switches for turning on and off the respective converted analog signals in accordance with a transmission on/off control signal, and band restriction filters for band-restricting the on-and-off controlled analog signals. Variation of the envelope is increased on the way of transmission as compared with just after the beginning of transmission and accordingly by suppressing leakage power between adjacent channels during transmission by the filters, the ramp process can be performed practically in accordance with on and off control of transmission by the switches.
Appareil de transmission utilisant le système de modulation dans lequel une enveloppe est réduite à zéro à un moment sur le chemin de transmission. Comprend un circuit de mappage pour mapper un signal de transmission dans la configuration de points de signaux, des convertisseurs N/A pour convertir en signaux analogiques correspondants les signaux destinés aux canaux I et Q obtenus par le circuit de mappage, des interrupteurs pour bloquer et débloquer les signaux analogiques convertis correspondants conformément à un signal de commande de blocage/déblocage de la transmission, et des filtres de restriction de bande pour restreindre les bandes des signaux analogiques bloqués/débloqués. La variation de l'enveloppe s'accroît sur le chemin de transmission plutôt que juste après le début de la transmission. De même, en supprimant la puissance de fuite entre les canaux adjacents pendant la transmission par les filtres, le processus graduel peut être exécuté en respectant pratiquement la commande de blocage/déblocage de la transmission par les commutateurs.
Marks & Clerk
Matsushita Electric Industrial Co. Ltd.
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