Multi-Branch Tomlinson-Harashima Precoders for Rate-Splitting-Based Cell-Free MIMO Systems

Cell-free (CF) systems have the potential to fulfill the increasing performance demand of future wireless applications by employing distributed access points (APs) that transmit the information over the same time-frequency resources. Due to the simultaneous transmission, multiuser interference (MUI)...

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Bibliographic Details
Published in:International Symposium on Wireless Communication Systems pp. 1 - 6
Main Authors: Flores, Andre R., de Lamare, Rodrigo C.
Format: Conference Proceeding
Language:English
Published: IEEE 14.07.2024
Subjects:
Cell-free wireless networks
MIMO
multiuser interference
Precoding
rate-splitting
robust precoding
Simulation
Sparse matrices
Time-frequency analysis
Transmitters
Uncertainty
Wireless communication
ISSN:2154-0225
Online Access:Get full text
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Summary:Cell-free (CF) systems have the potential to fulfill the increasing performance demand of future wireless applications by employing distributed access points (APs) that transmit the information over the same time-frequency resources. Due to the simultaneous transmission, multiuser interference (MUI) degrades the overall performance. To cope with the MUI in the downlink several linear precoding techniques, which rely on perfect channel state information at the transmitter (CSIT), have been studied. However, perfect CSIT is hardly obtained in practical systems. In this context, rate-splitting (RS) has arisen as a potential solution to deal with CSIT imperfections. In contrast to existing works, we explore non-linear precoding techniques based on the Tomlinson-Harashima precoder (THP) along with RS-CF systems. Furthermore, the multi-branch (MB) concept is included to further enhance the overall performance of the system. Simulations show that the proposed MB-THP for RS-based CF systems outperforms the conventional linear precoders.
ISSN:2154-0225
DOI:10.1109/ISWCS61526.2024.10639121