首页> 外文会议>IEEE International Conference on Communication Technology >A dynamic multiuser detection scheme for uplink SCMA system
【24h】

A dynamic multiuser detection scheme for uplink SCMA system

机译:上行SCMA系统的动态多用户检测方案

获取原文

摘要

As one of nonorthogonal multiple access techniques for the fifth generation mobile communications, sparse code multiple access(SCMA) can provide a better link performance than other schemes in different network scenarios. However, SCMA employs message passing algorithm (MPA) as its receiver decoding scheme which leads to higher computing complexity and restricts it's application to low latency networks. Based on this, a dynamic message passing algorithm (DMPA) is presented in this paper for reducing calculation complexity of original MPA. In DMPA, reliability of variable node can be calculated by the pseudo posterior probability after predetermined iterations, and then messages are propagated merely in subgraph of original factor graph which can result in a significant reduction in complexity. Simulation results show that DMPA can reduce decoding complexity about 37% than MPA with negligible bit error rate (BER) degradation.
机译:作为第五代移动通信的非正交多路访问技术之一,稀疏代码多路访问(SCMA)可以提供比不同网络方案中的其他方案更好的链接性能。但是,SCMA采用消息传递算法(MPA)作为其接收器解码方案,这导致更高的计算复杂度,并将其应用限制在低延迟网络中。在此基础上,提出了一种动态消息传递算法(DMPA),以降低原始MPA的计算复杂度。在DMPA中,可以通过预定迭代后的伪后验概率来计算变量节点的可靠性,然后仅在原始因子图的子图中传播消息,从而可以显着降低复杂度。仿真结果表明,DMPA可以比MPA降低约37%的解码复杂度,而误码率(BER)的下降却可以忽略不计。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号