Robust Rate-Splitting-Based Precoding for Cell-Free MU-MIMO Systems

Cell-free (CF) multiuser multiple-input multiple-output (MU-MIMO) systems are an emerging technology that provides service simultaneously to multiple users but suffers from multiuser interference (MUI). In this work, we propose a robust transmit scheme based on rate-splitting (RS) for CF MU-MIMO sys...

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Bibliographic Details
Published in:IEEE communications letters Vol. 29; no. 6; pp. 1230 - 1234
Main Authors: Flores, Andre R., de Lamare, Rodrigo C.
Format: Journal Article
Language:English
Published: New York IEEE 01.06.2025
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects:
Channel estimation
Fading channels
Information systems
Interference cancellation
Multiple-antenna systems
Optimization
Precoding
rate-splitting multiple access
robust techniques
Robustness
Simulation
Splitting
Statistical analysis
Symbols
Training
Vectors
ISSN:1089-7798, 1558-2558
Online Access:Get full text
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Summary:Cell-free (CF) multiuser multiple-input multiple-output (MU-MIMO) systems are an emerging technology that provides service simultaneously to multiple users but suffers from multiuser interference (MUI). In this work, we propose a robust transmit scheme based on rate-splitting (RS) for CF MU-MIMO systems in the presence of imperfect channel state information (CSI) and MUI. We also develop a robust linear precoder design for both private and common precoders based on the minimum mean square error (MMSE) criterion, which incorporates in its design statistical information about the imperfect CSI to provide extra robustness to RS-CF MU-MIMO systems. A statistical analysis is carried out to derive closed-form sum-rate expressions along with a study of the computational complexity of the proposed scheme. Simulation results show that the proposed scheme outperforms conventional robust and non-robust schemes.
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ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2025.3557743