太赫兹科学与电子信息学报2024，Vol.22Issue(7)：723-729,7.DOI:10.11805/TKYDA2022094
卫星物联网中多域联合活跃用户辨识方法
Multi-domain joint active user identification method in satellite Internet of Things
江诗禹 1高卫斌 2王宇琦 1刘子威 1张更新1
作者信息
- 1. 南京邮电大学 通信与信息工程学院,江苏 南京 210003
- 2. 北京跟踪与通信技术研究所,北京 100094
- 折叠
摘要
Abstract
In the uplink grant-free access scenario of the satellite Internet of Things(IoT),users directly send data to the satellite without the need for dynamic resource allocation,which makes it difficult for the receiving end to distinguish active users in advance.To recover the transmitted data,Active User Detection(AUD)is required.Currently,code domain methods are commonly used for active user identification,but the density of IoT devices far exceeds that of mobile communication users.Relying solely on code domain identification can lead to a dramatic increase in the dimension of address codes,reducing frame efficiency.Moreover,many collection and monitoring IoT terminals have weak capabilities and cannot report their own positions,resulting in the loss of this dimension of access auxiliary information,which is not conducive to improving the performance of active user detection.Aiming at the future development trend of satellite-borne phased array,this paper introduces the concept of spatial domain identification.By cascading identification in the spatial and code domains,a multi-domain joint method is used for active user detection.Simulation results show that the proposed method can enhance the identification capability when there is an address code conflict.关键词
卫星物联网/免授权接入/活跃用户检测/星载相控阵Key words
satellite Internet of Things/grant-free access/Active User Detection/space-borne phased array分类
信息技术与安全科学引用本文复制引用
江诗禹,高卫斌,王宇琦,刘子威,张更新..卫星物联网中多域联合活跃用户辨识方法[J].太赫兹科学与电子信息学报,2024,22(7):723-729,7.
