University of Oulu

B. Gouda, I. Atzeni and A. Tölli, "Distributed Precoding Design for Multi-Group Multicasting in Cell-Free Massive MIMO," GLOBECOM 2022 - 2022 IEEE Global Communications Conference, Rio de Janeiro, Brazil, 2022, pp. 2388-2393, doi: 10.1109/GLOBECOM48099.2022.10001654

Distributed precoding design for multi-group multicasting in cell-free massive MIMO

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Author: Gouda, Bikshapathi1; Atzen, Italo1; Tölli, Antti1
Organizations: 1Centre for Wireless Communications, University of Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.3 MB)
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Language: English
Published: IEEE, 2022
Publish Date: 2023-02-10


We consider multi-group multicast precoding designs for cell-free massive multiple-input multiple-output (MIMO) systems. To optimize the transmit and receive beamforming strategies, we focus on minimizing the sum of the maximum mean squared errors (MSEs) over the multicast groups, which is then approximated with the sum MSE to simplify the computation and signaling. We adopt an iterative bi-directional training scheme with uplink and downlink precoded pilots to cooperatively design the multi-group multicast precoders at each base station and the combiners at each user equipment in a distributed fashion. An additional group-specific uplink training resource is introduced, which entirely eliminates the need for backhaul signaling for channel state information (CSI) exchange. We also propose a simpler distributed precoding design based solely on group-specific pilots, which can be useful in the case of scarce training resources. Numerical results show that the proposed distributed methods greatly outperform conventional cell-free massive MIMO precoding designs that rely solely on local CSI.

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ISBN: 978-1-6654-3540-6
ISBN Print: 978-1-6654-3541-3
Pages: 2388 - 2393
DOI: 10.1109/globecom48099.2022.10001654
Host publication: GLOBECOM 2022 - 2022 IEEE Global Communications Conference
Conference: IEEE Global Communications Conference
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: The work of B. Gouda and A. Tölli was supported by the Academy of Finland (318927 6G Flagship). The work of I. Atzeni was supported by the Marie Skłodowska-Curie Actions (MSCA-IF 897938 DELIGHT) and by the Academy of Finland (336449 Profi6).
EU Grant Number: (897938) DELIGHT - Device-Centric Low-Complexity High-Frequency Networks
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
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