METHOD AND APPARATUS FOR TAILORING CARRIER POWER REQUIREMENTS ACCORDING TO AVAILABILITY IN LAYERED MODULATION SYSTEMS

摘要

A method and apparatus transmitting a layered modulation signal having a fir st 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 par t according to a first signal layer clear sky margin ML and a first signal lay er 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.