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Multilevel transmission technology for broadcasting data

This paper tries to develop a scheme of multilevel transmission for broadcasting data in wireless digital communication systems, which allows users to have a different data transmission rate according to the channel quality. Multilevel coded modulation (MLC) and multistage decoding (MSD) are the pivotal technology of this scheme. Some set partitioning strategies and MSD structures for 64 QAM constellations are discussed. The analysis and simulation results show that the block partitioning (BP) strategy and asymmetric constellations can provide unequal error protection for different priority bits. The simplified MSD structure greatly decreases the complexity and delay in decoding process.