通过对广度优先策略中有恒定复杂度的层排序k- best 球译码算法进行分析,提出一种每节点保留可变扩展节点的层排序 k-best 球形译码算法( k-best SDA II) , 在64QAM 调制及每层保留 8 节点的实数 SDA 模型下, 通过仿真的方法得出了保留恒定扩展节点的 k-best SDA 当每节点保留扩展节点数大于等于 2 时, 性能基本不变( k-bestSDA I)-Through the breadth-first strategy in a constant layer of complexity sort k-best sphere decoding algorithm for analysis, each node is proposed to retain the variable nodes expanded layer sorting k-best sphere decoding algorithm (k-best SDA II) In 64QAM modulation and keep each real number SDA 8-node model, obtained by simulation methods to retain a constant expansion node k-best SDA 2:00 when the number of nodes per node expansion greater than or equal retention, performance is essentially the same (k-bestSDA I)