Abstract
A multi-class multimedia broadcast/multicast service (MBMS) system includes a transmitter and at least one receiver. The transmitter transmits N primary signals by N primary channels and an auxiliary signal by an auxiliary channel, wherein the resolution of the auxiliary signal is identical to the primary signal with highest resolution and the locations of the auxiliary signal and the primary signal with highest resolution on the corresponding signal constellations can be coupled. The receiver couples the primary signal with the corresponding auxiliary signal/virtual auxiliary signal to obtain a lower resolution virtual auxiliary signal, which can also be coupled with the primary signal of the same resolution. Therefore, receiving quality of each resolution is improved by combining the primary signal and the corresponding auxiliary signal/virtual auxiliary signal.