University of Oulu

I. Atzeni, B. Gouda and A. Tölli, "Distributed Precoding Design via Over-the-Air Signaling for Cell-Free Massive MIMO," in IEEE Transactions on Wireless Communications, vol. 20, no. 2, pp. 1201-1216, Feb. 2021, doi: 10.1109/TWC.2020.3031807

Distributed precoding design via over-the-air signaling for cell-free massive MIMO

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Author: Atzeni, Italo1; Gouda, Bikshapathi1; Tölli, Antti1
Organizations: 1Centre for Wireless Communications, University of Oulu, Finland
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 1 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2021
Publish Date: 2021-04-23


Most works on cell-free massive multiple-input multiple-output (MIMO) consider non-cooperative precoding strategies at the base stations (BSs) to avoid extensive channel state information (CSI) exchange via backhaul signaling. However, considerable performance gains can be accomplished by allowing coordination among the BSs. This paper proposes the first distributed framework for cooperative precoding design in cell-free massive MIMO (and, more generally, in joint transmission coordinated multi-point) systems that entirely eliminates the need for backhaul signaling for CSI exchange. A novel over-the-air (OTA) signaling mechanism is introduced such that each BS can obtain the same cross-term information that is traditionally exchanged among the BSs via backhaul signaling. The proposed distributed precoding design enjoys desirable flexibility and scalability properties, as the amount of OTA signaling does not scale with the number of BSs or user equipments. Numerical results show fast convergence and remarkable performance gains as compared with non-cooperative precoding design. The proposed scheme can also outperform the centralized precoding design under realistic CSI acquisition.

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Series: IEEE transactions on wireless communications
ISSN: 1536-1276
ISSN-E: 1558-2248
ISSN-L: 1536-1276
Volume: 20
Issue: 2
Pages: 1201 - 1216
DOI: 10.1109/TWC.2020.3031807
Type of Publication: A1 Journal article – refereed
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: The work of I. Atzeni was supported by the Marie Sklodowska-Curie Actions (MSCA-IF 897938 DELIGHT). The work of B. Gouda and A. Tölli was supported by the Academy of Finland under grant no. 318927 (6Genesis Flagship).
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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