Patent ID: 8300568
Filing Date: 2012-10-30
Classification: H04L

Abstract:
1. A multi-class multimedia broadcast/multicast service system, comprising: a transmitter configured for transmitting N primary signals via N primary channels and an auxiliary signal via an auxiliary channel, wherein a resolution of said auxiliary signal is identical to the highest resolution of said N primary signals, and constellation mappings of said auxiliary signal and a primary signal having the highest resolution among said N primary signals are coupled to form a corresponding modulation constellation mapping with a lower resolution, and N is a positive integer; and at least one receiver, configured for coupling said auxiliary signal or a virtual auxiliary signal and one of said N primary signals having the same resolution to obtain said virtual auxiliary signal with a lower resolution; demodulating one of said N primary signals and said auxiliary signal or said virtual auxiliary signal based on said corresponding modulation constellation mappings, wherein said constellation mappings of said virtual auxiliary signal and one of said N primary signals having the same resolution are coupled to form said corresponding modulation constellation mapping with a lower resolution; and processing one of said N primary signals and said auxiliary signal/said virtual auxiliary signal having the same resolution by diversity combining to obtain desired information, and if there is no primary signal of a corresponding resolution, said receiver demodulates said auxiliary signal or said virtual auxiliary signal independently to obtain the desired information.