Method and apparatus for tailoring carrier power requirements according to availability in layered modulation systems
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United States of America Patent
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Feb 6, 2007
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N/A
app pub date -
Oct 15, 2003
filing date -
Oct 25, 2002
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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 C.sub.L at least in part according to a first signal layer clear sky margin M.sub.L and a first signal layer availability, determining an second signal layer modulation carrier power C.sub.U at least in part according to an second signal layer clear sky margin M.sub.U 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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