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《China Communications》 2018-11
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Polar Coded Iterative Multiuser Detection for Sparse Code Multiple Access System

Hang Mu;Youhua Tang;Li Li;Zheng Ma;Pingzhi Fan;Weiqiang Xu;School of Information Science and Technology, Southwest Jiaotong University;National Engineering Laboratory for integrated traffic data application technology;School of Information Science and Technology, Zhejiang Sci-Tech University;  
Polar coded sparse code multiple access(SCMA) system is conceived in this paper. A simple but new iterative multiuser detection framework is proposed, which consists of a message passing algorithm(MPA) based multiuser detector and a soft-input soft-output(SISO) successive cancellation(SC) polar decoder. In particular, the SISO polar decoding process is realized by a specifically designed soft re-encoder, which is concatenated to the original SC decoder. This soft re-encoder is capable of reconstructing the soft information of the entire polar codeword based on previously detected log-likelihood ratios(LLRs) of information bits. Benefiting from the soft re-encoding algorithm, the resultant iterative detection strategy is able to obtain a salient coding gain. Our simulation results demonstrate that significant improvement in error performance is achieved by the proposed polar-coded SCMA in additive white Gaussian noise(AWGN) channels, where the performance of the conventional SISO belief propagation(BP) polar decoder aided SCMA, the turbo coded SCMA and the low-density parity-check(LDPC) coded SCMA are employed as benchmarks.
【Fund】: supported in part by National Natural Science Foundation of China (no. 61571373 no. 61501383 no. U1734209 no. U1709219);; in part by Key International Cooperation Project of Sichuan Province (no. 2017HH0002);; in part by Marie Curie Fellowship (no. 792406);; in part by the National Science and Technology Major Project under Grant 2016ZX03001018-002;; in part by NSFC China-Swedish project (no. 6161101297)
【CateGory Index】: TN911.22
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