University of Oulu

T. Takahashi, A. Tölli, S. Ibi and S. Sampei, "Low-Complexity Large MIMO Detection via Layered Belief Propagation in Beam Domain," in IEEE Transactions on Wireless Communications, vol. 21, no. 1, pp. 234-249, Jan. 2022, doi: 10.1109/TWC.2021.3094970

Low-complexity large MIMO detection via layered belief propagation in beam domain

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Author: Takahashi, Takumi1; Tölli, Antti2; Ibi, Shinsuke3;
Organizations: 1Graduate School of Engineering, Osaka University, Suita 565-0871, Japan
2Centre for Wireless Communications (CWC), University of Oulu, FI-90014 Oulu, Finland
3Faculty of Science and Engineering, Doshisha University, Kyotanabe 610-0394, Japan
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.1 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2022
Publish Date: 2022-08-29


In large multi-user multi-input multi-output systems, the computational cost and circuit scale of base stations (BSs) are effectively reduced using two-stage signal processing consisting of a slow varying outer beamformer (OBF) based on long-term channel statistics and group-specific multi-user detection for instantaneous channel variations. However, the dimensionality reduction of the group-specific beam-domain channel based on the OBF causes significant performance degradation in the subsequent spatial-filtering detection. To compensate for this drawback, this paper introduces a novel layered belief propagation (BP) detector with a concatenated structure of beam- and antenna-domain BP layers for post-stage OBF processing. The proposed detector is designed for improving the convergence of iterative detection by suppressing intra- and inter-group interference in stages. The layered structure provides the advantages of both beam and antenna domains while maintaining low signal-processing complexity. Numerical results show the validity of our proposed method in terms of the bit error rate performance in both the uncoded and coded cases and the computational complexity.

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Series: IEEE transactions on wireless communications
ISSN: 1536-1276
ISSN-E: 1558-2248
ISSN-L: 1536-1276
Volume: 21
Issue: 1
Pages: 234 - 249
DOI: 10.1109/twc.2021.3094970
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 Japan Society for the Promotion of Science (JSPS) KAKENHI under Grant JP20K14734 and Grant JP21H01332 and in part by the Academy of Finland under Grant 311741 and Grant 313041.
Academy of Finland Grant Number: 311741
Detailed Information: 311741 (Academy of Finland Funding decision)
313041 (Academy of Finland Funding decision)
Copyright information: © The Author(s) 2021. This work is licensed under a Creative Commons Attribution 4.0 License. For more information, see