Improved MAX-Log MPA multiuser detection algorithm in SCMA system

Improved MAX-Log MPA multiuser detection algorithm in SCMA system

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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 glitter foam vellen action 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 puffy spa headband maintain the low complexity of the original MAX-Log MPA algorithm, but also obtains better detection performance.