University of Oulu

N. T. Nguyen, V. . -D. Nguyen, H. V. Nguyen, H. Q. Ngo, S. Chatzinotas and M. Juntti, "Downlink Throughput of Cell-Free Massive MIMO Systems Assisted by Hybrid Relay-Reflecting Intelligent Surfaces," ICC 2022 - IEEE International Conference on Communications, 2022, pp. 1475-1480, doi: 10.1109/ICC45855.2022.9838672.

Downlink throughput of cell-free massive MIMO systems assisted by hybrid relay-reflecting intelligent surfaces

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Author: Nguyen, Nhan T.1; Nguyen, V.-Dinh2; Nguyen, Hieu V.2;
Organizations: 1Centre for Wireless Communications, University of Oulu, Finland
2Interdisciplinary Centre for Security, Reliability and Trust (SnT), University of Luxembourg, Luxembourg
3School of Electronics, Electrical Engineering and Computer Science, Queen’s University, Belfast, United Kingdom
Format: article
Version: accepted version
Access: open
Online Access: PDF Full Text (PDF, 0.7 MB)
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Language: English
Published: Institute of Electrical and Electronics Engineers, 2022
Publish Date: 2023-01-09


We consider in this work a cell-free (CF) massive multiple-input-multiple-output (mMIMO) system where multiple hybrid relay-reflecting intelligent surfaces (HR-RIS) are deployed to assist communication between access points and users. We first present the signal model and derive the minimum-mean-square-error estimate of the effective channels. We then present a comprehensive analysis for the considered HR-RIS-aided CF mMIMO system, where the closed-form expression of the downlink throughput is derived. The presented analytical results are also valid for conventional CF mMIMO systems, i.e., CF mMIMO systems with and without passive reconfigurable intelligent surfaces. Finally, the analytical derivations are verified by extensive numerical results.

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Series: IEEE International Conference on Communications
ISSN: 1550-3607
ISSN-E: 1938-1883
ISSN-L: 1550-3607
ISBN: 978-1-5386-8347-7
ISBN Print: 978-1-5386-8348-4
Pages: 1475 - 1480
DOI: 10.1109/icc45855.2022.9838672
Host publication: ICC 2022 : IEEE International Conference on Communications
Conference: IEEE International Conference on Communications
Type of Publication: A4 Article in conference proceedings
Field of Science: 213 Electronic, automation and communications engineering, electronics
Funding: This work has been supported in part by Academy of Finland under 6Genesis Flagship (grant 318927), EERA Project (grant 332362), and Infotech Program funded by University of Oulu Graduate School.
Academy of Finland Grant Number: 318927
Detailed Information: 318927 (Academy of Finland Funding decision)
332362 (Academy of Finland Funding decision)
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