电讯技术2025，Vol.65Issue(5)：800-808,9.DOI:10.20079/j.issn.1001-893x.241113001
基于级联映射ZC序列的大容量GFRA前导设计方法
A Large-capacity GFRA Preamble Design Scheme Based on Concatenated Mapping ZC Sequences
摘要
Abstract
In grant-free random access(GFRA)systems for satellite-based Internet of Things scenarios,preamble collision has become a major factor limiting the improvement of user access performance,due to the impact of massive connections and random device activation.To address this issue,a large-capacity preamble sequence design and detection scheme based on hybrid Zadoff-Chu(ZC)sequences is proposed,by leveraging the advantages of orthogonal and non-orthogonal sequences in preamble detection and collision suppression.Specifically,the preamble sequence is first constructed by concatenating orthogonal ZC sequences with different root ZC sequences mapped through cyclic shifting.Then,a two-stage interference-cancellation active user detection algorithm based on hypothesis testing is employed to achieve accurate user identification in massive access scenarios.In addition,the preamble structure is extended by combining phase rotation factors with multi-segment non-orthogonal sequences,so as to further enlarge the capacity of the preamble set without increasing the peak-to-average power ratio.The proposed scheme exhibits significantly improved multi-user identification performance compared with existing composite and orthogonal preamble schemes.Under the same number of active users,the probability of successful detection is increased by approximately 30.3％at most.关键词
卫星物联网/免授权随机接入(GFRA)/活跃用户检测/级联映射前导/ZC序列Key words
satellite Internet of Things/grant-free random access(GFRA)/active user detection/concatenated mapping preambles/ZC sequences分类
电子信息工程引用本文复制引用
甄立,马明珂,裴晨晨,董萍,王文静,秦浩..基于级联映射ZC序列的大容量GFRA前导设计方法[J].电讯技术,2025,65(5):800-808,9.基金项目
国家自然科学基金资助项目(61901370) （61901370）
陕西省创新能力支撑计划(2023KJXX-062) （2023KJXX-062）
陕西省重点研发计划(2024GX-YBXM-064,2022ZDLGY05-08) （2024GX-YBXM-064,2022ZDLGY05-08）
陕西省教育厅重点项目(23JS057) （23JS057）
