针对动态用户的上行非正交多址接入技术  

Uplink Non-Orthogonal Multiple Access Technology for Dynamic Users

作　　者：祖婉婉 杨震[1,2,3] ZU Wan-wan;YANG Zhen(College of Communication & Information Engineering,Nanjing University of Posts and Telecommunications,Nanjing,Jiangsu 210003,China;Key Lab of Broadband Wireless Communication and Sensor Network Technology,Ministry of Education,Nanjing University of Posts and Telecommunications,Nanjing,Jiangsu 210003,China;National Local Joint Engineering Research Center for Communications and Network Technology,Nanjing University of Posts and Telecommunications,Nanjing,Jiangsu 210003,China)

机构地区：[1]南京邮电大学通信与信息工程学院,江苏南京210003 [2]南京邮电大学宽带无线通信与传感网技术教育部重点实验室,江苏南京210003 [3]南京邮电大学通信与网络技术国家地方联合工程研究中心,江苏南京210003

出　　处：《信号处理》2019年第2期217-224,共8页Journal of Signal Processing

基　　金：国家自然科学基金项目(61671252)

摘　　要：为了增强非正交多址接入技术(NOMA, non-orthogonal multiple access)应用场景的广泛性,本文给出了一个针对动态用户的上行NOMA系统。在传统的NOMA系统中,基站将用户到基站间的具体距离反馈给用户。由于在本文的场景中用户是动态分布的,基站实时地反馈具体距离势必会使系统开销过大。为了减少系统开销,本文假定基站只向用户反馈距离的统计特性,用户在之后的信息传输中根据距离的统计特性确定发射功率。理论分析了动态用户的中断性能并推导出了中断概率的表达式。仿真验证了理论推导的正确性,表明了当用户的分布区域内外边界值相差不大时,利用距离的统计特性和利用具体距离确定发射功率可以获得几乎相同的中断性能。In order to apply the non-orthogonal multiple access(NOMA)technology more extensively,this paper proposes an uplink NOMA system based on dynamic users.In the traditional NOMA system,the accurate distance between the user and the BS was fed back to the user.However,if the BS feeds back the specific distance in real time in the system with dynamic users,the overhead will be excessive.Therefore,it is assumed that the BS only feeds back the statistical characteristics of the distance which is used by the user to determine the transmit power in the subsequent information transmission.The outage performance of the proposed system is theoretically analyzed and the expression of the outage probability is derived.Simulations verify the accuracy of the theoretical results and show that using statistical characteristics or using specific distance to determine the transmit power can obtain almost the same outage performance if the boundary values of a user’s area are not much different.

关 键 词：上行非正交多址接入 动态用户 统计特性 系统开销 

分 类 号：TN929.5[电子电信—通信与信息系统]