卫星物联网场景下基于节点选择的协作波束成形技术研究  

Research on the Collaborative Beamforming Technique Based on the Node Selection for Satellite Internet of Things

作　　者：席博 洪涛[1] 张更新 XI Bo;HONG Tao;ZHANG Gengxin(College of Telecommunications&Information Engineering,Nanjing University of Post and Telecommunications,Nanjing 210003,China)

机构地区：[1]南京邮电大学通信与信息工程学院,南京210003

出　　处：《电子与信息学报》2020年第12期2882-2890,共9页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(91738201,61801445,61971440)。

摘　　要：针对卫星物联网(IoT)场景下信号长距离传输衰减大以及单个终端节点传输性能受限的问题,该文提出一种基于节点选择的协作波束成形算法,增强终端节点的传输能力。在实际终端位置信息存在误差的条件下,推导出了协作波束成形平均方向图函数,分析了不同系统参数对于协作波束成形平均方向图和瞬时方向图差异的影响。在此基础上,根据卫星物联网链路传输性能需求,提出一种区域分组优化的协作节点选择算法。仿真结果表明,相比于传统的分布式协作波束成形节点选择算法,该文提出的算法在实际的误差模型中旁瓣抑制和零陷生成方面具有更好的性能。The transmission performance of nodes in the satellite Internet of Things(IoT)is limited due to the long-distance transmission and the power-constrained terminal.A collaborative beamforming technique is proposed based on the node selection algorithm to improve the transmission performance of nodes.An average far-field beampattern for collaborative beamforming is derived by considering the location information error in practical scenario.Furthermore,the difference between average beampattern and instantaneous beampattern is analyzed by the system parameters.On this basis,a node selection algorithm is proposed based on region grouping not only to meet the requirement of satellite link,but also to suppress the sidelobe.Simulation results show better performance of the proposed algorithm compared with the traditional node selection algorithms in the actural error model.

关 键 词：卫星物联网 协作波束成形 节点选择 随机天线阵 

分 类 号：TN92[电子电信—通信与信息系统]