Optimized Resource Allocation in Scalable Video Broadcasting Using LDM and BDM

Combining non-orthogonal multiple access (NOMA) with scalable video coding (SVC) is an efficient transmission method to improve spectrum efficiency for the next generation digital broadcasting systems. As two candidate technologies of NOMA in physical layer, both bit division multiplexing (BDM) and layer division multiplexing (LDM) are discussed and compared in this paper. By analyzing the relationships among SNR thresholds, channel resources and capacities, we propose a novel resource allocation algorithm aiming at eliminating the coverage mismatch and maximizing the aggregated data rate (ADR) across the system. We start with the simple two-layer optimization problem, then extend the results to the multi-layer cases, which can be solved iteratively. Simulation results verify the advantages of the proposed algorithm in terms of better coverage performance and higher ADR.