一种新型上行SCMA系统接收机

稀疏码多址接入(SCMA)是一种码域非正交多址接入技术,以其优异性能成为5G多址接入技术的热门候选方案.上行SCMA系统一般采用消息传递算法(MPA)接收机,检测过程中存在由先验信息带来的误差.针对这一问题提出一种新型接收机,称为环MPA (R-MPA)接收机,其通过一种联合检测方案来消除上述误差对最终检测结果的影响.理论分析和仿真验证表明,与现有的log-MPA接收机及经典MPA接收机相比,所提R-MPA接收机是一种检测精度更高而实施复杂度较低的上行SCMA系统接收机.

A novel receiver for uplink SCMA system

Sparse code multiple access (SCMA) is a type of code domain non-orthogonal multiple access technology,which is regarded as a promising multiple access technology for 5G due to its excellent performance.The uplink SCMA system generally uses a message passing algorithm (MPA) in the receiver.The priori information can be inaccurated to cause an increased detection error.A novel receiver for the uplink SCMA system,called ring-MPA (R-MPA) receiver,was proposed to solve this problem,by using a joint detection process.The proposed R-MPA receiver was compared with the log-MPA receiver and the classic MPA receiver,two state-of-the-art existing schemes.Both theoretical analysis and computer simulation results show that the proposed receiver not only has a superior error performance,but also has a lower implementation complexity than these existing schemes.