NUC Optimization Design for Multi-layer Layered Division Multiplexing

Layered Division Multiplexing (LDM) is a powerbased non-orthogonal multiplexing (NOM) technology used in Advanced Television System Committee (ATSC) 3.0 next generation TV standard. To improve the performance of the multi-layer LDM system, this paper proposes a low-complexity scheme that optimizes the injection level and non-uniform constellation (NUC) to approach the capacity. The computable integral form of the bit interleaved coded modulation (BICM) capacity is derived for the multi-layer LDM. The injection levels are first optimized with the help of the BICM capacity formula. The NUCs are optimized layer by layer from the lower layer to the upper layer based on the optimized injection levels to maximize the BICM capacity. Simulation results show that the injection levels and NUCs obtained by the proposed scheme perform excellently and provide as much as 0.8 dB gain for the middle layers in the LDM system, compared with ATSC 3.0.