Method and apparatus for tailoring carrier power requirements according to availability in layered modulation systems
First Claim
1. A method of transmitting a layered modulation signal having a first signal layer having first signal symbols and a second signal layer having second signal symbols, comprising 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 to generate the layered modulation signal;
transmitting the modulated first signal symbols and second signal symbols; and
wherein the second signal layer clear sky margin is less than the first signal layer clear sky margin when the first signal layer availability and the second signal layer availability are substantially equal.
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Accused Products
Abstract
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.
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Citations
37 Claims
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1. A method of transmitting a layered modulation signal having a first signal layer having first signal symbols and a second signal layer having second signal symbols, comprising the steps of:
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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 to generate the layered modulation signal;
transmitting the modulated first signal symbols and second signal symbols; and
wherein the second signal layer clear sky margin is less than the first signal layer clear sky margin when the first signal layer availability and the second signal layer availability are substantially equal. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of transmitting a layered modulation signal having a first signal layer having first signal symbols and a second signal layer having second signal symbols, comprising the steps of:
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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 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;
transmitting the modulated first signal symbols and the modulated second signal symbols; and
wherein the second signal layer availability is greater than the first signal layer availability and the second signal layer clear sky margin MU equals wherein α
U at least partially represents the rain attenuation of the second modulation carrier, α
L at least partially represents the rain attenuation of the first layer modulation carrier, β
U at least partially represents the additional noise in the second modulation carrier due to rain, and β
L at least partially represents the additional noise in the first modulation carrier due to rain. - View Dependent Claims (8, 9, 10, 11, 12)
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13. An apparatus for transmitting a layered modulation signal having a first signal layer having first signal symbols and a second signal layer having second signal symbols, comprising:
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means for 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;
means for 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;
means for modulating the first signal symbols according to a first carrier at the determined first signal layer modulation carrier power;
means for modulating second signal symbols according to a second carrier at the determined second signal layer modulation carrier power to generate the second signal layer;
means for transmitting the modulated first signal symbols and the modulated second signal symbols; and
wherein the second signal layer clear sky margin is less than the first signal layer clear sky margin when the first signal layer availability and the second signal layer availability are substantially equal. - View Dependent Claims (14, 15, 16, 17, 18)
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19. An apparatus for transmitting a layered modulation signal having a first signal layer having first signal symbols and a second signal layer having second signal symbols, comprising:
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means for 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;
means for determining an second signal layer modulation carrier power CU at least in part according to an second layer clear sky margin MU and an second signal layer availability;
means for modulating the first signal symbols according to a first carrier at the determined first signal layer modulation carrier power;
means for modulating the second signal symbols according to a second carrier at the determined second signal layer modulation carrier power to generate the second modulated signal;
means for transmitting the modulated first signal symbols and the modulated second signal symbols; and
wherein the second signal layer availability is greater than the first signal layer availability and the second signal layer clear sky margin wherein α
U at least partially represents the rain attenuation of the second modulation carrier, α
L at least partially represents the rain attenuation of the first layer modulation carrier, β
U at least partially represents the additional noise in the second modulation carrier due to rain, and β
L at least partially represents the additional noise in the first modulation carrier due to rain. - View Dependent Claims (20, 21, 22, 23, 24)
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25. An apparatus for transmitting a layered modulation signal having a first signal layer having first signal symbols and a second signal layer having second signal symbols, comprising:
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a processor for 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, and for 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;
a modulator, communicatively coupled to the processor, the modulator for modulating the first signal symbols according to a first carrier at the determined first signal layer modulation carrier power;
a second modulator, communicatively coupled to the processor, the second modulator for modulating second signal symbols according to a second carrier at the determined second signal layer modulation carrier power to generate the second signal layer;
at least one transmitter, communicatively coupled to the modulator and the second modulator, the at least one transmitter for transmitting the modulated first signal symbols and the modulated second signal symbols; and
wherein the second signal layer clear sky margin is less than the first signal layer clear sky margin when the first signal layer availability and the second signal layer availability are substantially equal. - View Dependent Claims (26, 27, 28, 29, 30)
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31. An apparatus for transmitting a layered modulation signal having a first signal layer having first signal symbols and a second signal layer having second signal symbols, comprising:
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a processor, for 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, and for determining an second signal layer modulation carrier power CU at least in part according to an second layer clear sky margin MU and an second signal layer availability;
a modulator, communicatively coupled to the processor, the modulator for modulating the first signal symbols according to a first carrier at the determined first signal layer modulation carrier power;
a second modulator, communicatively coupled to the processor, the second modulator for modulating the second signal symbols according to a second carrier at the determined second signal layer modulation carrier power to generate the second modulated signal;
at least one transmitter, communicatively coupled to the second modulator, the second modulator for transmitting the modulated first signal symbols and the modulated second signal symbols; and
wherein the second signal layer availability is greater than the first signal layer availability and the second signal layer clear sky margin wherein α
U at least partially represents the rain attenuation of the second modulation carrier, α
L at least partially represents the rain attenuation of the first layer modulation carrier, β
U at least partially represents the additional noise in the second modulation carrier due to rain, and β
L at least partially represents the additional noise in the first modulation carrier due to rain. - View Dependent Claims (32, 33, 34, 35, 36, 37)
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Specification