功率受限CR-NOMA协作V2X中断性能分析  

Analysis of the outage performance of the cooperative V2X with the power-constrained CR-NOMA

作　　者：乔宇航 张良梅 贺玉成[1,2] 周林[1,2] QIAO Yuhang;ZHANG Liangmei;HE Yucheng;ZHOU Lin(Xiamen Key Laboratory of Mobile Multimedia Communications,Huaqiao University,Xiamen 361021,China;State Key Laboratory of Integrated Services Networks,Xidian University,Xi’an 710071,China)

机构地区：[1]华侨大学厦门市移动多媒体通信重点实验室,福建厦门361021 [2]西安电子科技大学综合业务网理论及关键技术国家重点实验室,陕西西安710071

出　　处：《西安电子科技大学学报》2022年第2期97-107,共11页Journal of Xidian University

基　　金：国家自然科学基金(61901182);福建省自然科学基金(2018J01096);华侨大学研究生科研创新基金(18013082031)。

摘　　要：考虑无线信息与能量传输在底层认知非正交多址车联网的应用,在次级网络受主网络干扰的情况下,根据非正交多址网络的技术特点,提出了一种适用于非正交多址网络的两阶段中继选择方案。在第1时隙,次级网络源节点采用固定功率分配方案向所有中继广播叠加信号,功率分配方案由第2跳链路信道质量的统计特性决定。第2时隙,根据中继接收信号分两个步骤选择最优中继,所选中继采用能量分裂的无线信息与能量传输协议自接收信号中采集能量,并在主网络信号干扰下为次级用户提供解码转发服务,转发再编码信号所需的能量开销均来自能量采集,不考虑编译码电路的能量消耗。两个次级网络用户在受到主网络干扰的情况下使用串行干扰消除技术对所接收到的叠加信号进行译码,在干扰温度限约束下推导了各次级用户受主网络干扰时中断概率的近似表达式,并对数值分析的正确性进行了验证。通过分析次级用户中断概率受各系统参数的影响,证明了TSRS方案相比于现有体制在提升中断性能方面的优越性。Considering the application of wireless information and energy transmission in the underlying cognitive non-orthogonal multiple access network of vehicles,a two-stage relay selection scheme for NOMA networks is proposed according to the statistical characteristics of NOMA networks when the secondary network is interfered by the primary network.In the first slot,the secondary network source node broadcasts superimposed signals to all relays using a fixed power allocation scheme,which is determined by the statistical characteristics of the channel quality of the second hop link.In the second slot,by selecting the optimal relay in two steps based on the signal received at the relay,the selected relay uses the power splitting scheme to perform the SWIPT,and the power collected is used only to forward the decoded signal with the energy consumption of coding and decoding not considered.Two secondary users use successive interference cancellation technology to decode the received superposed signals.At the same time the secondary users are interfered by the primary network signal.Under the limit of the interference temperature constraint,the approximate expression for the interruption probability of each secondary user is derived,and the correctness of the numerical analysis is verified.By analyzing the influence of system parameters on the interrupt probability of secondary users,it is proved that the TSRS scheme is superior to the existing system in improving the interrupt performance.

关 键 词：非正交多址接入 中继选择 认知无线电 无线信息与功率传输 

分 类 号：TN911.22[电子电信—通信与信息系统]