University of Oulu

Y. Wang, W. Xu, M. Juntti, J. Lin and M. Pan, "Composite Preambles Based on Differential Phase Rotations for Grant-free Random Access Systems," in IEEE Internet of Things Journal, doi: 10.1109/JIOT.2023.3274453.

Composite preambles based on differential phase rotations for grant-free random access systems

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Author: Wang, Yang1; Xu, Wenjun1,2; Juntti, Markku3;
Organizations: 1State Key Laboratory of Network and Switching Technology, Beijing University of Posts and Telecommunications, Beijing, China
2Department of Mathematics and Theories, Peng Cheng Laboratory, Shenzhen, China
3Centre for Wireless Communications-Radio Technologies, University of Oulu, Oulu, Finland
4Key Lab of Universal Wireless Communications, Ministry of Education, Beijing University of Posts and Telecommunications, Beijing, P. R. China
5Department of Electrical and Computer Engineering, University of Houston, Houston, TX, USA
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 5.3 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2023
Publish Date: 2023-05-12


With the advantages of low signaling overhead and latency, grant-free random access (GFRA) becomes a promising technology for supporting massive machine-type communications (mMTC), but poses new challenges for active user detection (AUD) and channel estimation (CE), whose performance mainly depends on the preamble detection. In this paper, we design the composite preamble based on differential phase rotations by aggregating orthogonal Zadoff-Chu (ZC) sequences and multiple root ZC sequences with differential phase rotations to reduce the probability of preamble collisions, thereby improving the performance of AUD and CE. In particular, differential phase rotations extend the preamble set size so that users colliding in orthogonal sequences can be distinguished by phase rotations. In addition, it also reduces non-orthogonal interference and thus reduces CE errors. The preamble detection algorithm and CE scheme are proposed, along with the theoretical analysis of AUD and CE performance to verify the effectiveness of the designed preamble. In addition, the proposed preamble is extended to combine phase rotations with cyclic shifts to further enlarge the preamble set size with low non-orthogonality. Simulation results show that the proposed composite preamble outperforms existing preambles in terms of the probability of detection and CE accuracy.

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Series: IEEE internet of things journal
ISSN: 2372-2541
ISSN-E: 2327-4662
ISSN-L: 2327-4662
DOI: 10.1109/JIOT.2023.3274453
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work was supported in part by the National Natural Science Foundation of China, under grant 62293485, in part by the Fundamental Research Funds for the Central Universities, under grant 2022RC18, in part by the Academy of Finland ROHM project (grant 319485) and 6G Flagship (grant 346208), in part by the BUPT Excellent Ph.D. Students Foundation (CX2021207), and in part by the China Scholarship Council.
Academy of Finland Grant Number: 319485
Detailed Information: 319485 (Academy of Finland Funding decision)
346208 (Academy of Finland Funding decision)
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