An Improved Threshold-based Low Complexity Multiuser Detection Scheme for Sparse Code Multiple Access System
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摘要: 稀疏码多址接入(Sparse Code Multiple Access, SCMA)作为一种基于多维码本的非正交多址技术，能有效满足5G的巨连接、高频谱效率和毫秒级时延需求。针对基于门限的消息传递算法(Message Passing Algorithm, MPA)存在低门限时误比特率(Bit Error Rate, BER)较高的问题，该文提出一种改进的SCMA多用户检测算法。所提出的算法在基于门限MPA的基础上，增加了对用户节点稳定性必要条件的判决，即只有符合门限条件并通过用户节点稳定性必要条件判决的用户才能被提前解码。这提高了提前判决码字的可靠性并减少了因变相硬判的检测机制造成的后验软信息损失。与基于门限的MPA相比，所提出的算法可使消息在低门限时迭代得更加充分，从而在低门限时仍然能够使SCMA用户获得较好的BER性能。仿真结果表明，在低门限时采用该文所提出的算法SCMA用户BER性能明显好于仅采用基于门限的MPA的BER性能。Abstract: Sparse Code Multiple Access (SCMA) is a non-orthogonal multiple access technology based on multi-dimensional codebook, which can effectively address challenges in 5G such as massive connectivity, high spectral efficiency and millisecond delay. For the problem that threshold-based Message Passing Algorithm (MPA) has a high Bit Error Rate (BER) when the threshold is low, an improved SCMA multiuser detection scheme is proposed in this paper. Based on the threshold MPA scheme, the proposed scheme adds a judgment on the necessary conditions of user node stability. The users who not only satisfy the threshold criterion but also pass the judgment on the necessary conditions of user node stability can be decoded in advance. This improves the reliability of codeword which is judged in advance and reduces the loss of posterior soft information caused by the detection mechanism similar to the hard decision. Compared with the threshold-based MPA scheme, the proposed scheme allows the messages to be iterated more fully at low thresholds, which makes SCMA users achieve better BER performance at low thresholds. The simulation results show that better BER performance is achieved with the proposed scheme than that with the threshold-based MPA scheme for SCMA users.
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