A Joint Activity and Data Detection Scheme for Asynchronous Grant-Free Rateless Multiple Access

作     者：Wei Zhang Xiaofeng Zhong Shidong Zhou Wei Zhang;Xiaofeng Zhong;Shidong Zhou

作者机构：Department of Electronic EngineeringTsinghua UniversityBeijing 100084China 

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：34-52页

核心收录：

学科分类：0810[工学-信息与通信工程] 08[工学] 0804[工学-仪器科学与技术] 080402[工学-测试计量技术及仪器] 

基　　金：supported by the projects as follows,Key Research and Development Program of China(2018YFB1801102) the Key Research and Development Program of China(2020YFB1806603) Fundamental Research Funds for the Central Universities under Grant 2242022k60006 Tsinghua University-China Mobile Communications Group Co.,Ltd.Joint Institute,Civil Aerospace Technology Project(D040202) National Natural Science Foundation of China(Grant No.92067206) TsinghuaQualcomm Joint Project,Tsinghua University Initiative Scientific Research Program(20193080005)。 

主　　题：asynchronous grant-free JADD rateless codes 

摘      要：This paper considers the frameasynchronous grant-free rateless multiple access(FAGF-RMA)scenario,where users can initiate access at any symbol time,using shared channel resources to transmit data to the base station.Rateless coding is introduced to enhance the reliability of the system.Previous literature has shown that FA-GFRMA can achieve lower access delay than framesynchronous grant-free rateless multiple access(FSGF-RMA),with extreme reliability enabled by rateless coding.To support FA-GF-RMA in more practical scenarios,a joint activity and data detection(JADD)scheme is proposed.Exploiting the feature of sporadic traffic,approximate message passing(AMP)is exploited for transmission signal matrix estimation.Then,to determine the packet start points,a maximum posterior probability(MAP)estimation problem is solved based on the recovered transmitted signals,leveraging the intrinsic power pattern in the codeword.An iterative power-pattern-aided AMP algorithm is devised to enhance the estimation performance of AMP.Simulation results verify that the proposed solution achieves a delay performance that is comparable to the performance limit of FA-GF-RMA.