期刊
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
卷 69, 期 4, 页码 3562-3574出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2020.2969020
关键词
Sparse code multiple access (SCMA); deterministic message passing algorithm (DMPA); folding; retiming; VLSI
资金
- NSFC [61871115, 61501116]
- Jiangsu Provincial NSF for Excellent Young Scholars [BK20180059]
- Six Talent Peak Program of Jiangsu Province [2018-DZXX-001]
- Distinguished Perfection Professorship of Southeast University
- Fundamental Research Funds for the Central Universities
- SRTP of Southeast University
Being an effective non-orthogonal multiple access (NOMA) technique, sparse code multiple access (SCMA) is promising for future wireless communication. Compared with orthogonal techniques, SCMA enjoys higher overloading tolerance and lower complexity because of its sparsity. In this paper, based on deterministic message passing algorithm (DMPA), algorithmic simplifications such as domain changing and probability approximation are applied for SCMA decoding. Early termination, adaptive decoding, and initial noise reduction are also employed for faster convergence and better performance. Numerical results show that the proposed optimizations benefit both decoding complexity and speed. Furthermore, efficient hardware architectures based on folding and retiming are proposed. VLSI implementation is also given in this paper. Comparison with the state-of-the-art have shown the proposed decoder's advantages in both latency and throughput (multi-Gbps).
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