Abstract
Sparse code multiple access (SCMA) is a promising type of non-orthogonal multiple access technology which has the characteristic of improving the system spectrum efficiency. Device to device (D2D) underlaid cellular system is a prospective network structure that allows spectrum resources reusing. Therefore, the combination of D2D with SCMA will play a crucial role in the future wireless communication networks. Research on the combination of D2D with SCMA is limited, especially in terms of resource allocation. Consequently, we consider an uplink multi-cell SCMA based D2D underlaid cellular system aiming to optimize the system throughput. A novel Mode selection and User Preference Matching (MUPM) algorithm based on matching theory is proposed. First, each user finds a suitable communication mode through mode selection, and then the sharing of SCMA codebooks is formulated as a two-sided matching problem. Simulation results demonstrate that the proposed MUPM algorithm has about 50% throughput gain compared with Random Allocation (RA) and about 30% throughput gain compared with Greedy Selection (GS). Furthermore, the MUPM is superior to GS with respect to user fairness by considering user preference in the codebook sharing process.
Published Version
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