Downlink Throughput of Cell-Free Massive MIMO Systems Assisted by Hybrid Relay-Reflecting Intelligent Surfaces

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-squ...

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Bibliographic Details
Main Authors: Nguyen, Nhan T., Nguyen, V.-Dinh, Nguyen, Hieu V., Ngo, Hien Q., Chatzinotas, Symeon, Juntti, Markku
Format: Conference Proceeding
Language:English
Subjects:
Cell-free massive MIMO
Channel estimation
Closed-form solutions
Conferences
hybrid relay-reflecting intelligent surface
Massive MIMO
Reconfigurable intelligent surfaces
Rician channels
Throughput
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Summary: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.
ISSN:1938-1883
DOI:10.1109/ICC45855.2022.9838672