多用户多中继系统下协作NOMA的中断性能  

Outage performance of cooperative NOMA under multiuser and multi-relay system

作　　者：刘凯 李新颖[1] 郝浩 LIU Kai;LI Xinying;HAO Hao(School of Electronics and Information Engineering,Lanzhou Jiaotong University,Lanzhou Gansu 730070,China)

机构地区：[1]兰州交通大学电子信息工程学院,甘肃兰州730070

出　　处：《太赫兹科学与电子信息学报》2020年第4期586-594,共9页Journal of Terahertz Science and Electronic Information Technology

基　　金：国家自然科学基金资助项目(61301179,61661025,61661026)。

摘　　要：在基于非正交多址接入技术(NOMA)的多用户多中继协作中继网络中,为优先满足混叠信号中的时延敏感信息的服务质量(QoS)需求,对功率因子进行了简单分析,进而找到了关于信道增益的解码限制条件。在给定中继的情况下,根据解码限制条件建立用户集合,进而找到可以使高QoS信号速率最大化的用户中继对作为最佳"用户-中继"来传递信号。并且对该"用户-中继"选择方案下的系统中断概率的表达式进行推导并求出了其渐进式。仿真结果验证了推导结果的正确性,系统的中断概率随着节点数目的增多而降低,而当信噪比趋于无穷时,系统的分集增益取决于用户数目和中继数目。且与已有文献进行对比,本文提出的用户中继匹配方案的中断性能相对较好。The outage performance of cooperative Non-Orthogonal Multiple Access(NOMA) network adapting Amplify and Forward(AF) is investigated. In the multi-user multi-relay cooperative NOMA network, in order to guarantee the Quality of Service(QoS) requirement of the signal with low latency in the mixed signal, a power allocation scheme is proposed, and then the detection constraint conditions are obtained. Furthermore, for the given relay, the set is built according to the detection constraint conditions, and the user relay pair which can maximize the rate of high QoS signal is selected as the best "user-relay" to transmit the message. The expression equation of the system’s outage probability for the proposed user-relay selective scheme is derived and the asymptotic expression is solved. Simulation results prove the correctness of the derived results, and show that the system’s outage probability decreases with the increasing of the number of the relays. Especially when the Signal-to-noise ratio tends to be infinite, the system’s diversity gain is depended on the number of the relay. In addition, the outage performance of the proposed scheme is better than that in other existing literatures.

关 键 词：非正交多址接入 协作中继 功率分配 用户中继对 中断概率 

分 类 号：TN929.5[电子电信—通信与信息系统]