Fabian Göttsch
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View article: Optimizing Fronthaul Quantization for Flexible User Load in Cell-Free Massive MIMO
Optimizing Fronthaul Quantization for Flexible User Load in Cell-Free Massive MIMO Open
We investigate the physical layer (PHY) spectral efficiency and fronthaul network load of a scalable user-centric cell-free massive MIMO system. Each user-centric cluster processor responsible for cluster-level signal processing is located…
View article: An Overview of Network-Related Challenges in Cell-Free 6G
An Overview of Network-Related Challenges in Cell-Free 6G Open
View article: User-Centric Cell-Free Wireless Networks for 6G: Communication Theoretic Models and Research Challenges
User-Centric Cell-Free Wireless Networks for 6G: Communication Theoretic Models and Research Challenges Open
This paper presents a comprehensive communication theoretic model for the physical layer of a cell-free user-centric network, formed by user equipments (UEs), radio units (RUs), and decentralized units (DUs), uniformly spatially distribute…
View article: Joint Fronthaul Load Balancing and Computation Resource Allocation in Cell-Free User-Centric Massive MIMO Networks
Joint Fronthaul Load Balancing and Computation Resource Allocation in Cell-Free User-Centric Massive MIMO Networks Open
We consider scalable cell-free massive multiple-input multiple-output networks under an open radio access network paradigm comprising user equipments (UEs), radio units (RUs), and decentralized processing units (DUs). UEs are served by dyn…
View article: Fairness Scheduling in User-Centric Cell-Free Massive MIMO Wireless Networks
Fairness Scheduling in User-Centric Cell-Free Massive MIMO Wireless Networks Open
We consider a user-centric cell-free massive MIMO wireless network with $L$ remote radio units, each with $M$ antennas, serving $K_{\rm tot}$ user equipments (UEs). Most of the literature considers the regime $LM \gg K_{\rm tot}$, where th…
View article: User-Centric Clustering Under Fairness Scheduling in Cell-Free Massive MIMO
User-Centric Clustering Under Fairness Scheduling in Cell-Free Massive MIMO Open
We consider fairness scheduling in a user-centric cell-free massive MIMO network, where $L$ remote radio units, each with $M$ antennas, serve $K_{\rm tot} \approx LM$ user equipments (UEs). Recent results show that the maximum network sum …
View article: Fairness Scheduling in Dense User-Centric Cell-Free Massive MIMO Networks
Fairness Scheduling in Dense User-Centric Cell-Free Massive MIMO Networks Open
We consider a user-centric scalable cell-free massive MIMO network with a total of $LM$ distributed remote radio unit antennas serving $K$ user equipments (UEs). Many works in the current literature assume $LM\gg K$, enabling high UE data …
View article: Overloaded Pilot Assignment with Pilot Decontamination for Cell-Free Systems
Overloaded Pilot Assignment with Pilot Decontamination for Cell-Free Systems Open
The pilot contamination in cell-free massive multiple-input-multiple-output (CF-mMIMO) must be addressed for accommodating a large number of users. In previous works, we have investigated a decontamination method called subspace projection…
View article: Robust PCA for Subspace Estimation in User-Centric Cell-Free Wireless Networks
Robust PCA for Subspace Estimation in User-Centric Cell-Free Wireless Networks Open
We consider a scalable user-centric cell-free massive MIMO network with distributed remote radio units (RUs), enabling macrodiversity and joint processing. Due to the limited uplink (UL) pilot dimension, multiuser interference in the UL pi…
View article: Optimal User Load and Energy Efficiency in User-Centric Cell-Free Wireless Networks
Optimal User Load and Energy Efficiency in User-Centric Cell-Free Wireless Networks Open
Cell-free massive MIMO is a variant of multiuser MIMO and massive MIMO, in which the total number of antennas $LM$ is distributed among the $L$ remote radio units (RUs) in the system, enabling macrodiversity and joint processing. Due to pi…
View article: Subspace-Based Pilot Decontamination in User-Centric Scalable Cell-Free Wireless Networks
Subspace-Based Pilot Decontamination in User-Centric Scalable Cell-Free Wireless Networks Open
We consider a cell-free wireless system operated in Time Division Duplex (TDD) mode with user-centric clusters of remote radio units (RUs). Since the uplink pilot dimensions per channel coherence slot is limited, co-pilot users might incur…
View article: Uplink-Downlink Duality and Precoding Strategies with Partial CSI in Cell-Free Wireless Networks
Uplink-Downlink Duality and Precoding Strategies with Partial CSI in Cell-Free Wireless Networks Open
We consider a scalable user-centric wireless network with dynamic cluster formation as defined by Björnsson and Sanguinetti. After having shown the importance of dominant channel subspace information for uplink (UL) pilot decontamination a…
View article: The Impact of Subspace-Based Pilot Decontamination in User-Centric Scalable Cell-Free Wireless Networks
The Impact of Subspace-Based Pilot Decontamination in User-Centric Scalable Cell-Free Wireless Networks Open
We consider a scalable user-centric wireless network with dynamic cluster formation as defined by Björnsson and Sanguinetti. Several options for scalable uplink (UL) processing are examined including: i) cluster size and SNR threshold crit…
View article: The Impact of Subspace-Based Pilot Decontamination in User-Centric\n Scalable Cell-Free Wireless Networks
The Impact of Subspace-Based Pilot Decontamination in User-Centric\n Scalable Cell-Free Wireless Networks Open
We consider a scalable user-centric wireless network with dynamic cluster\nformation as defined by Bj\\"ornsson and Sanguinetti. Several options for\nscalable uplink (UL) processing are examined including: i) cluster size and SNR\nthreshol…