洪涛,,
张更新
南京邮电大学通信与信息工程学院 南京 210003
基金项目:国家自然科学基金(91738201, 61801445, 61971440)
详细信息
作者简介:席博：男，1996年生，硕博连读生，研究方向为卫星通信
洪涛：男，1982年生，讲师，研究方向为多天线收发系统、卫星通信
张更新：男，1967年生，教授，博士生导师，研究方向为卫星通信、深空通信、空间信息网络等
通讯作者:洪涛 hongt@njupt.edu.cn
中图分类号:TN92计量
文章访问数:1504
HTML全文浏览量:381
PDF下载量:88
被引次数:0
出版历程
收稿日期:2019-09-16
修回日期:2020-04-27
网络出版日期:2020-05-28
刊出日期:2020-12-08
Research on the Collaborative Beamforming Technique Based on the Node Selection for Satellite Internet of Things
Bo XI,Tao HONG,,
Gengxin ZHANG
College of Telecommunications & Information Engineering, Nanjing University of Post and Telecommunications, Nanjing 210003, China
Funds:The National Natural Science Foundation of China (91738201, 61801445, 61971440)
摘要
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。
关键词:卫星物联网/
协作波束成形/
节点选择/
随机天线阵
Abstract: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.
Key words:Satellite Internet of Things (IoT)/
Collaborative beamforming/
Node selection/
Random array antenna
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