Improved MAX-Log MPA multiuser detection algorithm in SCMA system

• Main Authors: Wu Xiong, Ge Wenping, Zhang Xuewan, Dai Wenli
• Format: Article
• Language: zho
• Published: National Computer System Engineering Research Institute of China 2018-05-01
• Series: Dianzi Jishu Yingyong
• Subjects: 5G; non-orthogonal multiple access; SCMA; multiuser detection; MPA
• Online Access: http://www.chinaaet.com/article/3000082873

Sparse code multiple access(SCMA) is a novel non-orthogonal multiple access scheme to face the future 5G communication. In allusion to the problem that sparse code multiple access(SCMA) system based on a logarithm-domain MAX-Log message passing algorithm(MPA) for multiuser detection has lower detection performance, this paper adopts a method that the message updating formula of the resource node is multiplied by a factor, which can reduce the lost messages of the original MAX-Log MPA algorithm for approximate computing the updating message of resource node. The theory and simulation results show that the improved MAX-Log MPA multiuser detection algorithm can not only maintain the low complexity of the original MAX-Log MPA algorithm, but also obtains better detection performance.