Serial multi-user dynamic iteration method based on SCMA (Sparse Code Multiple Access) system

The invention provides a serial multi-user dynamic iteration method based on an SCMA (Sparse Code Multiple Access) system. The method comprises the steps of sorting user nodes; carrying out one round of iteration decoding from a plurality of user nodes to a plurality of resource nodes; when the iteration decoding tends to convergence, obtaining all redundancy values from the user nodes to the resource nodes; comparing the redundancy values with a set threshold in sequence; when the redundancy values satisfy a threshold condition, terminating an iteration decoding process, otherwise, finding the user node with the maximum serial number from all redundancy values not satisfying the threshold condition; and carrying out a next round of iteration decoding, wherein in this round, only the user nodes with the serial numbers smaller than or equal to the maximum serial number are iterated. According to the method, through reasonable setting of the threshold, the certain number of iteration is carried out on the user