摘要
智能电网中存在大量大功率电气设备及通信传感设备严重阻碍定位系统的信号传输,针对多基站多通信用户干扰的情况下可重构智能超表面(Reconfigurable Intelligent Surface,RIS)辅助的非正交多址接入(Non-Orthogonal Multiple Access,NOMA)通信系统难以准确定位弱信号的问题,考虑智能电网场景下的多小型基站多用户对定位用户的影响,提出以定位用户的水平误差为评估基准,在保证通信用户的服务质量(Quality of Service,QoS)的前提下,联合基站功率、多基站多用户干扰以及功率分配系数,采用拉格朗日对偶方法以及次梯度法处理多用户多小型基站带来的非凸问题。结果表明,资源分配相同的情况下,所考虑的RIS-NOMA智能电网通感系统相比NOMA通感系统可使系统平均定位误差明显降低。
In smart grids,the presence of numerous high-power electrical devices and communication sensing equipment severely hinders signal transmission in positioning systems.To address the challenge of accurately locating weak signals in a Reconfigurable Intelligent Surface(RIS)-assisted Non-Orthogonal Multiple Access(NOMA)system under interference from multiple base stations and communication users,this paper considers the impact of multiple small base stations and multiple users in a smart grid environment.A horizontal positioning error of the target user is used as the evaluation metric.While ensuring the Quality of Service(QoS)for communication users,the proposed method jointly optimizes base station power,multi-user interference,and power allocation factors.The Lagrangian dual method and sub-gradient approach are employed to solve the non-convex optimization problem caused by multiple users and small base stations.Simulation results demonstrate that,under the same resource allocation,the proposed RIS-NOMA integrated sensing and communication system significantly reduces the average positioning error compared to traditional NOMA-based system.
作者
段潇蓉
马军伟
赵敏
张得路
李美玲
DUAN Xiaorong;MA Junwei;ZHAO Min;ZHANG Delu;LI Meiling(Information and Communications Branch,State Grid Shanxi Electric Power Company,Taiyuan 030021,China;School of Electronic Information Engineering,Taiyuan University of Seience and Technology,Taiyuan 030024,China)
出处
《无线电通信技术》
北大核心
2025年第5期967-975,共9页
Radio Communications Technology
基金
国网山西省电力公司科技项目(52051C24000D)。
