H - Electricity – 03 – C
Patent
H - Electricity
03
C
H03C 3/02 (2006.01) H04L 25/03 (2006.01) H04L 27/20 (2006.01)
Patent
CA 2244609
The successive symbols (a j) of a digital stream are converted into phase increments (.DELTA.~) which are accumulated. A modulating phase (~) is obtained by filtering the accumulated phase. A complex signal is produced whose argument represents the modulating phase. Two phase quadrature radio waveforms are respectively modulated on the basis of that complex signal, and a radio signal resulting from a combination of the two modulated waveforms is transmitted. The complex signal is, in turn, filtered digitally. Its real and imaginary components (I,Q) are converted into analog form, and are subjected to anti-aliasing analog filtering and then mixed with the two radio waveforms. Appropriate sizing of the digital filters provides efficient modulation with small envelope variations, causing little adjacent channel interference and a low error rate.
Les symboles successifs (a j) d'un train numérique sont convertis en incréments de phase (.DELTA.~) qui sont accumulés. Une phase de modulation (~) est obtenue par filtrage de la phase accumulée. Un signal complexe dont l'argument représente la phase de modulation est produit. Les deux ondes radio en quadrature de phase sont respectivement modulées en fonction d'un signal complexe, et un signal radio résultant d'une combinaison des deux ondes modulées est transmis. Le signal complexe fait l'objet d'un filtrage numérique. Ses composantes réelles et imaginaires (I, Q) sont converties sous forme analogique, et font l'objet d'un filtrage analogique antirepliement, puis sont mélangées aux deux ondes radio. Le dimensionnement voulu des filtres numériques assure une modulation efficace avec de faibles variations d'enveloppe, ce qui maintient faibles le brouillage dans le canal adjacent et le taux d'erreurs.
Marque-Pucheu Gerard
Roseiro Albert
Eads Secure Networks
Fetherstonhaugh & Co.
Matra Nortel Communications
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