A Concatenated Mapping ZC Sequences Based Large-Capacity Grant-Free Random Access Preamble Design Method for Satellite Internet of Things

• Main Authors: Ma, Mingke, Zhen, Li, Li, Shuchang, Pei, Chenchen, Qin, Hao
• Format: Conference Proceeding
• Language: English
• Subjects: active user detection; concatenated mapping preambles; Design methodology; grant-free random access; Information and communication technology; Internet of Things; Internet of Things (IoT); Multiuser detection; Reliability; Satellite communication; Satellites; Simulation
• ISSN: 2836-7782
• DOI: 10.1109/ICEICT61637.2024.10670848

Satellite communication has garnered widespread attention due to its wide coverage and flexible deployment, and is expected to be a promising solution for achieving reliable access of ubiquitous Internet of Things (IoT) devices. Given the efficiency of grant-free random access (GF-RA) in massive machine-type communications, this paper investigates the preamble sequence design and detection issue for GF-RA in satellite-based IoT. Specifically, a concatenated mapping preamble is designed by concatenating orthogonal Zadoff-Chu (ZC) sequences and multiple root ZC sequences processed through Kronecker product operations, which can effectively reduce the collision probability of preambles and further improve the detection performance of active users. In particular, the proposed method remarkably expands the capacity of the preamble set, thereby the users colliding in orthogonal sequences can be identified by detecting non-orthogonal sequences. Furthermore, we propose a two-stage multi-user detection method and theoretically derive the success detection probability of active users. Simulation results show that our proposed method can have a notable improved detection performance as compared to the existing ones.