电力线通信信道下协作非正交多址接入系统的分布式机会中继选择  

Distributed Opportunistic Relay Selection for Cooperative Non-Orthogonal Multiple Access Power Line Communication Networks

作　　者：蒲红红 刘晓胜[1] 韩铭 徐殿国[1] Pu Honghong;Liu Xiaosheng;Han Ming;Xu Dianguo(School of Electrical Engineering and Automation Harbin Institute of Technology,Harbin 150001,China)

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001

出　　处：《电工技术学报》2020年第11期2306-2318,共13页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(51677034);黑龙江省自然科学基金(ZD2018012)资助项目。

摘　　要：该文将非正交多址接入(NOMA)技术应用于下行多中继协作电力线通信(PLC)网络,考虑对数正态信道衰落和伯努利-高斯信道噪声,设计机会式中继选择方案。首先,根据电力线信道的瞬时信道状态信息(ICSI)进行目的节点排序,同时自适应调整功率分配系数。其次,以满足目的节点服务质量(QoS)要求和最小化系统功耗为目标,分别针对译码转发(DF)和放大转发(AF)协议设计基于加权调和平均的分布式机会中继选择方案。然后,分别分析两协议下的系统性能并进行Monte-Carlo仿真分析。结果表明,所设计方案可获得比基准方案更优的系统性能;该文DF方案能够进行两次功率分配系数动态调整,并可获得比AF方案更高的吐量性能;此外,该方案分布式进行,能够节约用于ICSI反馈的信令开销。In this paper, non-orthogonal multiple access(NOMA) technique was applied to downlink multiple-relay cooperative power line communication(PLC) networks. And with considering the fading channel modeled by log-normal distribution and the additive noise modeled by two-state Bernoulli-Gauss, an opportunistic relay selection scheme was proposed. The node order was first designed and power allocation coefficients were adaptively adjusted according to the instantaneous channel state information(ICSI) of the PLC channels. In order to meet the quality of service(QoS) requirements of destination nodes and minimize the system power consumption, the distributed opportunistic relay selection schemes based on the maximum weighted harmonic mean were then respectively designed for decode-and-forward(DF) and amplify-and-forward(AF) protocols. Next, the system outage probability and throughput were analyzed and verified by Monte-Carlo simulations. The results show that the performances of the proposed scheme are better than those of benchmark schemes;compared to our AF scheme, the higher system throughput performance can be achieved by our DF scheme due to its twice power allocation coefficients adjusting. Also, our scheme can be executed in distribution thereby saving the signaling overhead for the ICSI feedback.

关 键 词：中继电力线通信 非正交多址接入 对数正态衰落 中继选择 中断概率 

分 类 号：TN915[电子电信—通信与信息系统]