Relevance-Based Information Processing for Fronthaul Rate Reduction in Cell-Free MIMO Systems

Consider a user equipment in a Cell-Free massive Multiple-Input Multiple-Output (CF-mMIMO) system that is served by several Radio Access Points (RAPs). In the uplink of this setup, these RAPs receive noisy observations of the user/source signal and must locally compress their signals before forwardi...

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Published in:International Symposium on Wireless Communication Systems pp. 1 - 6
Main Authors: Danaee, Alireza, Hassanpour, Shayan, Wubben, Dirk, Dekorsy, Armin
Format: Conference Proceeding
Language:English
Published: IEEE 14.07.2024
Subjects:
Cell-Free massive MIMO
Central Processing Unit
Compressors
distributed joint source-channel coding
Encoding
information bottleneck method
Information processing
Massive MIMO
mutual information
Numerical simulation
Wireless communication
ISSN:2154-0225
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Abstract Consider a user equipment in a Cell-Free massive Multiple-Input Multiple-Output (CF-mMIMO) system that is served by several Radio Access Points (RAPs). In the uplink of this setup, these RAPs receive noisy observations of the user/source signal and must locally compress their signals before forwarding them to the Central Processing Unit (CPU) through multiple rate-limited fronthaul channels. To retrieve the source signal at CPU, we are interested in maximizing the Mutual Information (MI) between the received signals at CPU and the user/source signal, and purposefully choose the Information Bottleneck (IB)-based compression techniques to design the quantizers at RAPs. We consider both separate and joint designs of the local compressors by establishing basic trade-offs between the informativity and compactness of the outcomes. For the joint design, two different schemes are presented, based on whether to leverage the side-information at CPU. Finally, the effectiveness of both compression schemes will be shown as well by means of numerical investigations over typical digital data transmission scenarios.
AbstractList Consider a user equipment in a Cell-Free massive Multiple-Input Multiple-Output (CF-mMIMO) system that is served by several Radio Access Points (RAPs). In the uplink of this setup, these RAPs receive noisy observations of the user/source signal and must locally compress their signals before forwarding them to the Central Processing Unit (CPU) through multiple rate-limited fronthaul channels. To retrieve the source signal at CPU, we are interested in maximizing the Mutual Information (MI) between the received signals at CPU and the user/source signal, and purposefully choose the Information Bottleneck (IB)-based compression techniques to design the quantizers at RAPs. We consider both separate and joint designs of the local compressors by establishing basic trade-offs between the informativity and compactness of the outcomes. For the joint design, two different schemes are presented, based on whether to leverage the side-information at CPU. Finally, the effectiveness of both compression schemes will be shown as well by means of numerical investigations over typical digital data transmission scenarios.
Author Wubben, Dirk
Dekorsy, Armin
Hassanpour, Shayan
Danaee, Alireza
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  givenname: Shayan
  surname: Hassanpour
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  givenname: Dirk
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  givenname: Armin
  surname: Dekorsy
  fullname: Dekorsy, Armin
  email: dekorsy@ant.uni-bremen.de
  organization: University of Bremen,Department of Communications Engineering,Germany
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Snippet Consider a user equipment in a Cell-Free massive Multiple-Input Multiple-Output (CF-mMIMO) system that is served by several Radio Access Points (RAPs). In the...
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SubjectTerms Cell-Free massive MIMO
Central Processing Unit
Compressors
distributed joint source-channel coding
Encoding
information bottleneck method
Information processing
Massive MIMO
mutual information
Numerical simulation
Wireless communication
Title Relevance-Based Information Processing for Fronthaul Rate Reduction in Cell-Free MIMO Systems
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