期刊
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
卷 67, 期 12, 页码 12398-12403出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2018.2876121
关键词
Sparse code multiple access; variational free energy; Bethe approximation; convergence analysis
资金
- National Science Foundation of China (NSFC) [61471037, 61571041]
- Foundation for the Author of National Excellent Doctoral Dissertation of China [201445]
- Australian Research Council [DP150104019]
- NSFC [61531006, 61772233]
- Engineering and Physical Sciences Research Council of the Royal Society's Global Challenges Research Fund [EP/Noo4558/1, EP/PO34284/1]
- European Research Council's Advanced Fellow Grant QuantCom.
- EPSRC [EP/N004558/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/N004558/1] Funding Source: researchfish
Sparse code multiple access (SCMA) has emerged as a promising non-orthogonal multiple access technique for the next-generation wireless communication systems. Since the signal of multiple users is mapped to the same resources in SCMA, its detection imposes a higher complexity than that of the orthogonal schemes, where each resource slot is dedicated to a single user. In this paper, we propose a low-complexity receiver for SCMA systems based on the radical variational free energy framework. By exploiting the pairwise structure of the likelihood function, the Bethe approximation is utilized for estimating the data symbols. The complexity of the proposed algorithm only increases linearly with the number of users, which is much lower than that of the maximum a posteriori detector associated with exponentially increased complexity. Furthermore, the convergence of the proposed algorithm is analyzed, and its convergence conditions are derived. Simulation results demonstrate that the proposed receiver is capable of approaching the error probability performance of the conventional message-passing-based receiver.
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