OFDMA-Based Unsourced Random Access in LEO Satellite Internet of Things

作     者：Jiaqi Fang Gangle Sun Wenjin Wang Li You Rui Ding Jiaqi Fang;Gangle Sun;Wenjin Wang;Li You;Rui Ding

作者机构：National Mobile Communications Research LaboratorySoutheast UniversityNanjing 210096China Purple Mountain LaboratoriesNanjing 211100China Institute of Telecommunication SatelliteCASTBeijing 100094China 

出 版 物：《China Communications》 (中国通信（英文版）)

年 卷 期：2024年第21卷第1期

页      面：13-23页

核心收录：

学科分类：0810[工学-信息与通信工程] 080904[工学-电磁场与微波技术] 0809[工学-电子科学与技术（可授工学、理学学位）] 08[工学] 080402[工学-测试计量技术及仪器] 0804[工学-仪器科学与技术] 081001[工学-通信与信息系统] 

基　　金：supported by the National Key R&D Program of China under Grant 2023YFB2904703 the National Natural Science Foundation of China under Grant 62341110,62371122 and 62322104 the Jiangsu Province Basic Research Project under Grant BK20192002 the Fundamental Research Funds for the Central Universities under Grant 2242022k30005 and 2242023K5003 

主　　题：LEO OFDMA satellite unsourced random access UPA 

摘      要：This paper investigates the low earth orbit(LEO)satellite-enabled coded compressed sensing(CCS)unsourced random access(URA)in orthogonal frequency division multiple access(OFDMA)framework,where a massive uniform planar array(UPA)is equipped on the *** LEO satellite communications,unavoidable timing and frequency offsets cause phase shifts in the transmitted signals,substantially diminishing the decoding performance of current terrestrial CCS URA *** cope with this issue,we expand the inner codebook with predefined timing and frequency offsets and formulate the inner decoding as a tractable compressed sensing(CS)***,we leverage the inherent sparsity of the UPA-equipped LEO satellite angular domain channels,thereby enabling the outer decoder to support more active ***,the outputs of the outer decoder are used to reduce the search space of the inner decoder,which cuts down the computational complexity and accelerates the convergence of the inner *** results verify the effectiveness of the proposed scheme.