User-centric Cell-free Massive MIMO Networks: A Survey of Opportunities, Challenges and Solutions
Densification of network base stations is indispensable to achieve the stringent Quality of Service (QoS) requirements of future mobile networks. However, with a dense deployment of transmitters,...
Handoff Design in User-Centric Cell-Free Massive MIMO Networks Using DRL
In the user-centric cell-free massive MIMO (UC-mMIMO) network scheme, user mobility necessitates updating the set of serving access points to maintain the user-centric clustering. Such updates are...
Downlink Resource Allocation in Multiuser Cell-free MIMO Networks with User-centric Clustering
In this paper, we optimize user scheduling, power allocation and beamforming in distributed multiple-input multiple-output (MIMO) networks implementing user-centric clustering. We study both the...
The Internet of Senses: Building on Semantic Communications and Edge Intelligence
The Internet of Senses (IoS) holds the promise of flawless telepresence-style communication for all human `receptors' and therefore blurs the difference of virtual and real environments. We...
Distributed Resource Allocation Optimization for User-Centric Cell-Free MIMO Networks
We develop two distributed downlink resource allocation algorithms for user-centric, cell-free, spatially-distributed, multiple-input multiple-output (MIMO) networks. In such networks, each user...
Regularized Top-$k$: A Bayesian Framework for Gradient Sparsification
Error accumulation is effective for gradient sparsification in distributed settings: initially-unselected gradient entries are eventually selected as their accumulated error exceeds a certain...
Analysis and Design of Distributed MIMO Networks with a Wireless Fronthaul
We consider the analysis and design of distributed wireless networks wherein remote radio heads (RRHs) coordinate transmissions to serve multiple users on the same resource block (RB)....
RWP+: A New Random Waypoint Model for High-Speed Mobility
In this letter, we emulate real-world statistics for mobility patterns on road systems. We then propose modifications to the assumptions of the random waypoint (RWP) model to better represent...
POMDP-based Handoffs for User-Centric Cell-Free MIMO Networks
We propose to control handoffs (HOs) in user-centric cell-free massive MIMO networks through a partially observable Markov decision process (POMDP) with the state space representing the discrete...
Delay-Tolerant Constrained OCO with Application to Network Resource Allocation
We consider online convex optimization (OCO) with multi-slot feedback delay, where an agent makes a sequence of online decisions to minimize the accumulation of time-varying convex loss functions,...
Resource Allocation and Scheduling in Non-coherent User-centric Cell-free MIMO
We study the problem of user-scheduling and resource allocation in distributed multi-user, multiple-input multiple-output (MIMO) networks implementing user-centric clustering and non-coherent...
Distributed coordinated precoding for MIMO cellular network virtualization
This paper presents a new virtualization method for the downlink of a multi-cell multiple-input multiple-output (MIMO) network, to achieve service isolation among multiple Service Providers (SPs)...
Periodic Updates for Constrained OCO with Application to Large-Scale Multi-Antenna Systems
In many dynamic systems, decisions on system operation are updated over time, and the decision maker requires an online learning approach to optimize its strategy in response to the changing...
Statistical Analysis of Downlink Zero-Forcing Beamforming
We analyze the mean and the variance of the useful signal and interference powers in a multi-cell network using zero-forcing beamforming (ZF-BF) with two beamformer normalization approaches. While...
Optimizing RRH Placement Under a Noise-Limited Point-to-Point Wireless Backhaul
In this paper, we study the deployment decisions and location optimization for the remote radio heads (RRHs) in coordinated distributed networks in the presence of a wireless backhaul. We...
Online Multi-Cell Coordinated MIMO Wireless Network Virtualization with Imperfect CSI
We consider online coordinated precoding design for downlink wireless network virtualization (WNV) in a multi-cell multiple-input multiple-output (MIMO) network with imperfect channel state...
Resource Allocation for Massive MIMO HetNets with Quantize-Forward Relaying
We investigate how massive MIMO impacts the uplink transmission design in a heterogeneous network (HetNet) where multiple users communicate with a macro-cell base station (MCBS) with the help of a...
Online Distributed Coordinated Precoding for Virtualized MIMO Networks with Delayed CSI
We consider online wireless network virtualization (WNV) in a multi-cell multiple-input multiple output (MIMO) system with delayed feedback of channel state information (CSI). Multiple service...