Rate-Splitting Multiple Access Over Cell-Free Massive MIMO With Low-Resolution ADCs

In this paper, we explore the potential of rate-splitting multiple access (RSMA) in a cell-free (CF) massive multiple-input multiple-output (MIMO) system integrated with low-resolution analog-to-digital converters (ADCs). Both the access points (APs) and the user equipment (UEs) deploy low-resolutio...

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Veröffentlicht in:IEEE transactions on wireless communications Jg. 23; H. 12; S. 18870 - 18886
Hauptverfasser: Obeng Agyapong, Jonathan, Anokye, Prince, Shin, Suho, Kwao Ahiadormey, Roger, Lee, Kyoung-Jae
Format: Journal Article
Sprache:Englisch
Veröffentlicht: New York IEEE 01.12.2024
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Schlagworte:
Algorithms
Analog to digital converters
cell-free (CF) massive multiple-input multiple-output (MIMO)
Contamination
Downlink
Energy resolution
Interference
low-resolution analog-to-digital converters (ADCs)
Massive MIMO
MIMO communication
Monte Carlo simulation
Multiaccess communication
Multiple access
Precoding
Quantization (signal)
Rate-splitting multiple access (RSMA)
spectral efficiency (SE)
Splitting
Streams
Wireless communication
ISSN:1536-1276, 1558-2248
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Zusammenfassung:In this paper, we explore the potential of rate-splitting multiple access (RSMA) in a cell-free (CF) massive multiple-input multiple-output (MIMO) system integrated with low-resolution analog-to-digital converters (ADCs). Both the access points (APs) and the user equipment (UEs) deploy low-resolution ADCs. Thus, quantization noise (QN) limits the system's performance. The limited coherence interval and the large number of users result in pilot contamination. This arises since multiple users may share the same pilot sequence in the uplink training. We investigate the spectral/energy efficiency (SE/EE) of an RSMA-enabled CF massive MIMO downlink transmission due to the robustness of RSMA against interference. We derive the closed-form SE expressions for the common and private streams which are shown to be exact when compared to Monte Carlo simulations. We optimize the combining weights of the common precoder to maximize the minimum user SE due to the common stream. It is shown that substantial SE gains and higher EE are achieved using the proposed algorithm in the presence of QN and imperfect channel state information. Our results emphasize that RSMA can be adopted to enhance the SE and EE while reducing the quantization bits.
Bibliographie:ObjectType-Article-1
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ISSN:1536-1276
1558-2248
DOI:10.1109/TWC.2024.3477728