NOMA下行链路结合大规模 MIMO的预编码  

NOMA Downlink Combined with Massive MIMO Precoding

作　　者：王金伏 王鹤鸣 战金龙[1] 段会兰 江帆[1] WANG Jin-fu;WANG He-ming;ZHAN Jin-long;DUAN Hui-lan;JIANG Fan(Shaanxi Key Laboratory of Information Communication Network and Security,Xi’an University of Posts and Telecommunications,Xi’an 710121,China)

机构地区：[1]西安邮电大学陕西省信息通信网络及安全重点实验室,西安710121

出　　处：《光通信研究》2019年第3期65-70,共6页Study on Optical Communications

基　　金：国家自然科学基金资助项目(61501371);科技部重大专项资助项目(2017ZX03001012-005);陕西省国际交流与合作资助项目(2015KW-012)

摘　　要：非正交多址接入(NOMA)是5G无线网络的基本支持技术,可满足大规模连接和高吞吐量的异构需求,能增加可接入的用户数。NOMA的关键思想是同一资源块为多个用户提供服务,系统可容纳的用户数增加,但对系统容量的提升有限,针对此问题,文章提出在NOMA的基础上,将其与大规模多输入多输出(MIMO)天线结合,提高系统的容量,同时将下行多用户按照信道差异进行用户匹配,两两分为一簇,簇与簇之间的干扰采用块对角化(BD)算法进行消除,簇内用户之间的干扰采用串行干扰进行消除。仿真结果表明:发送端采用BD预编码可降低终端受到的干扰,结合大规模MIMO的NOMA系统频谱效率有很大提升;在此基础上进行用户匹配分组后,系统性能进一步提升。Non-Orthogonal Multiple Access (NOMA) is a basic support technology for the 5G wireless networks. It can meet the heterogeneous requirements of large-scale connectivity and high throughput with increasing number of access subscriber. The key idea of NOMA is that the same resource block provides services for multiple users. The supported number of users can be increased. However, the upgrade of system capacity is limited. To solve this issue, the paper combines NOMA technology with massive Multiple-input Multiple-output (MIMO) antenna to improve the capacity of the system. At the same time, the downlink multi-users perform user matching according to channel differences, and the two are divided into one cluster. Block Diagonalization (BD) algorithm is used to eliminate the interference between the clusters. The interference between users in the cluster is eliminated by serial interference. The simulation results show that the BD precoding at the transmitter side can reduce the interference received by the terminal. The system capacity based on NOMA technology combined with massive MIMO is greatly improved. The system performance can be further improved when user matching grouping is performed on this basis.

关 键 词：非正交多址接入 大规模多输入多输出 用户匹配 块对角化算法 

分 类 号：TN929.53[电子电信—通信与信息系统]