Method and apparatus for tailoring carrier power...

H - Electricity – 04 – L

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Details

H04L 27/00 (2006.01) H04H 20/74 (2009.01) H04B 7/185 (2006.01) H04J 1/08 (2006.01) H04L 27/26 (2006.01) H04N 5/76 (2006.01) H04N 7/06 (2006.01)

Patent

CA 2503133

A method and apparatus transmitting a layered modulation signal having a first signal layer having first signal symbols and a second signal layer having second signal symbols is disclosed. The method comprises the steps of determining a first signal layer modulation carrier power CL at least in part according to a first signal layer clear sky margin ML and a first signal layer availability, determining an second signal layer modulation carrier power CU at least in part according to an second signal layer clear sky margin MU and an second signal layer availability, modulating the first signal symbols according to a first carrier at the determined first signal layer modulation carrier power; modulating the second signal symbols according to a second carrier at the determined second signal layer modulation carrier power, and transmitting the two layers independently.

L'invention concerne un procédé et un appareil de transmission d'un signal de modulation en couches qui comprend une première couche de signal pourvue de premiers symboles de signal et une seconde couche de signal dotée de seconds symboles de signal. Ce procédé consiste à déterminer une puissance d'onde porteuse de modulation de la première couche de signal C<SB>L</SB> au moins partiellement en fonction d'une marge de ciel clair de la première couche de signal M<SB>L</SB> et une disponibilité de la première couche de signal, à déterminer une puissance d'onde porteuse de modulation de la seconde couche de signal C<SB>U</SB> au moins partiellement en fonction d'une marge de ciel clair de la seconde couche de signal M<SB>U</SB> et une disponibilité de la seconde couche de signal, à moduler les premiers symboles du signal selon une première onde porteuse à la puissance déterminée de l'onde porteuse de modulation de la première couche de signal, à moduler les seconds symboles du signal selon une seconde onde porteuse à la puissance déterminée de l'onde porteuse de modulation de la seconde couche de signal, et à transmettre les deux couches indépendamment.

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