基于双向中继和网络编码的NOMA网络性能分析  

Performance Analysis of NOMA Network Based on Two-way Relay and Network Coding

作　　者：银泽正 杨震[1,2] 冯友宏 YIN Zezheng;YANG Zhen;FENG Youhong(College of Communication&Information Engineering,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;Anhui Normal University,Wuhu,Anhui 241199,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]南京邮电大学通信与网络技术国家地方联合工程研究中心,江苏南京210003 [3]安徽师范大学,安徽芜湖241199

出　　处：《信号处理》2021年第5期747-756,共10页Journal of Signal Processing

基　　金：国家自然科学基金资助项目(61671252,62071242);安徽省自然科学基金资助项目(2008085MF181);国家自然科学基金面上项目(62071005);安徽省高校省级自然科学研究重点基金(KJ2019A0936)。

摘　　要：针对实际场景中存在的具有上下行双向传输任务的通信系统,本文提出了一种双向中继协作非正交多址接入(NOMA,non-orthogonal multiple access)传输方案,基于解码转发(DF,Decode and Forward)协议研究信号的上行和下行双向传输技术,与现有NOMA方案不同,本方案为近端用户分配较大的功率,利用网络编码(NC,network coding)原理在两个时隙内实现基站和用户之间的双向信息交换。进一步考虑不完美信道状态信息(CSI,Channel State Information)条件,分析系统的传输性能并推导了系统中断概率以及遍历和速率闭合表达式。仿真结果表明,在完美CSI和不完美CSI条件下,相比于现有文献所提方案、单向中继(OWR,One-Way Relay)和正交多址(OMA,Orthogonal Multiple Access)网络,本文所提方案有效降低了系统的传输中断概率,提高了系统的遍历和速率以及系统吞吐量。For the communication system with uplink and downlink bidirectional transmission task in the actual scene,this paper proposes a two-way relay cooperative non-orthogonal multiple access(NOMA)transmission scheme,which studies the uplink and downlink two-way transmission of signals based on decode and forward(DF)protocol.This scheme allocates more power to the near user which different from the existing NOMA schemes,and realizes bidirectional information exchange between base station and users by network coding(NC)principle.Further considering the imperfect channel state information(CSI)condition,the transmission performance of the system is analyzed,and the expressions of outage probability,ergodic sum rate are derived.Simulation results show that,compared with the scheme proposed in the existing literature,one-way relay(OWR)and orthogonal multiple access(OMA)networks,the proposed scheme can effectively reduce the transmission outage probability,improve the traversal rate and throughput of the system under perfect CSI and imperfect CSI conditions.

关 键 词：非正交多址 双向中继 协作通信 中断概率 和速率 

分 类 号：TN929.5[电子电信—通信与信息系统]