Transmitter, receiver, multi-class multimedia broadcast/multicast service system and modulation method thereof

A transmitter pairing with at least one receiver to form a multi-class multimedia broadcast/multicast service system:

• wherein said receiver is configured for coupling an auxiliary signal or a virtual auxiliary signal and one of N primary signals having the same resolution to obtain a virtual auxiliary signal with a lower resolution and demodulating said auxiliary signal/said virtual auxiliary signal and one of said N primary signals having the same resolution to obtain desired information, and said transmitter is characterized in:
• transmitting said N primary signals via N primary channels;
• and
• transmitting said 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.

A receiver pairing with a transmitter to form a multi-class multimedia broadcast/multicast service system, wherein said transmitter transmits 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 said receiver is characterized in:

• 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 mapping, 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 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.

A modulation method for transmitting multi-resolution data comprising:

• 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;
• coupling said auxiliary signal and one of said N primary signals having the highest resolution to obtain a virtual auxiliary signal with a lower resolution and demodulating one of said N primary signals and said 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 by diversity combining to obtain desired information, and if there is no primary signal of a corresponding resolution, the receiver demodulates said auxiliary signal or said virtual auxiliary signal independently to obtain the desired information.