Link adaptation of a broadcast system

A system for adaptively controlling layered modulation of a multiple base station multicast broadcast service, comprising:

• a plurality of base stations each broadcasting a same layered modulation signal;
• a plurality of subscribers receiving the layered modulation signal, and each subscriber determining a signal quality of the received layered modulation signal;
• the plurality of subscribers each reporting the signal quality back to the plurality of base stations;
• the plurality of base stations collecting the reported signal qualities over a predetermined period of time;
• each of the plurality of base stations reporting the collected signal qualities to a base station controller;
• and
• the base station controller statistically determining a desired signal power differential between levels of the layered modulation signals based on the collected signal qualities.