research
∙
05/30/2023
Optimal Geometries of Dual-Polarized Arrays for Large Point-to-Point MIMO Channels
Traditional point-to-point line-of-sight channels have rank 1, irrespect...
share
research
∙
05/21/2023
Multi-Static Target Detection and Power Allocation for Integrated Sensing and Communication in Cell-Free Massive MIMO
This paper studies an integrated sensing and communication (ISAC) system...
research
∙
05/12/2023
A Bayesian Approach to Characterize Unknown Interference Power in Wireless Networks
The existence of unknown interference is a prevalent problem in wireless...
research
∙
04/05/2023
25 Years of Signal Processing Advances for Multiantenna Communications
Wireless communication technology has progressed dramatically over the p...
research
∙
03/29/2023
Optimizing Reconfigurable Intelligent Surfaces for Short Transmissions: How Detailed Configurations can be Afforded?
In this paper, we examine how to minimize the total energy consumption o...
research
∙
03/29/2023
Optimizing Reconfigurable Intelligent Surfaces for Small Data Packets: A Subarray Approach
In this paper, we examine the energy consumption of a user equipment (UE...
research
∙
02/27/2023
Spherical Wavefronts Improve MU-MIMO Spectral Efficiency When Using Electrically Large Arrays
Modern MIMO communication systems are almost exclusively designed under ...
research
∙
02/18/2023
mmWave Coverage Extension Using Reconfigurable Intelligent Surfaces in Indoor Dense Spaces
In this work, we consider the deployment of reconfigurable intelligent s...
research
∙
01/16/2023
UL-DL duality for cell-free massive MIMO with per-AP power and information constraints
We derive a novel uplink-downlink duality principle for optimal joint pr...
research
∙
01/15/2023
Cell-Free Massive MIMO in O-RAN: Energy-Aware Joint Orchestration of Cloud, Fronthaul, and Radio Resources
The physical-layer foundations of cell-free massive MIMO are now well-es...
research
∙
12/05/2022
Improving Fairness for Cell-Free Massive MIMO Through Interference-Aware Massive Access
Cell-free massive multiple-input multiple-output (CF mMIMO) provides goo...
research
∙
11/17/2022
Activity Detection in Distributed Massive MIMO With Pilot-Hopping and Activity Correlation
Many real-world scenarios for massive machine-type communication involve...
research
∙
09/22/2022
Maximum Likelihood Channel Estimation for RIS-Aided Communications With LOS Channels
A reconfigurable intelligent surface (RIS) reflects incoming signals in ...
research
∙
09/07/2022
Near-Field Beamforming and Multiplexing Using Extremely Large Aperture Arrays
The number of users that can be spatially multiplexed by a wireless acce...
research
∙
09/05/2022
Optimized Precoding for MU-MIMO With Fronthaul Quantization
One of the first widespread uses of multi-user multiple-input multiple-o...
research
∙
09/05/2022
Power Allocation for Joint Communication and Sensing in Cell-Free Massive MIMO
This paper studies a joint communication and sensing (JCAS) system with ...
research
∙
09/02/2022
Indoor Positioning Trends in 5G-Advanced: Challenges and Solution towards Centimeter-level Accuracy
After robust connectivity, precise positioning is evolving into an innov...
research
∙
08/24/2022
Team Precoding Towards Scalable Cell-free Massive MIMO Networks
In a recent work, we studied a novel precoding design for cell-free netw...
research
∙
08/08/2022
Channel Estimation under Hardware Impairments: Bayesian Methods versus Deep Learning
This paper considers the impact of general hardware impairments in a mul...
research
∙
06/16/2022
Downlink Spectral Efficiency of Massive MIMO with Dual-Polarized Antennas
This paper considers the downlink of a single-cell massive MIMO (multipl...
research
∙
05/23/2022
Exploiting Array Geometry for Reduced-Subspace Channel Estimation in RIS-Aided Communications
A reconfigurable intelligent surface (RIS) can be used to improve the ch...
research
∙
05/05/2022
Sparse Large-Scale Fading Decoding in Cell-Free Massive MIMO Systems
Cell-free massive multiple-input multiple-output (CF mMIMO) systems are ...
research
∙
05/04/2022
Combining Reciprocity and CSI Feedback in MIMO Systems
Reciprocity-based time-division duplex (TDD) Massive MIMO (multiple-inpu...
research
∙
03/15/2022
Intelligent Reconfigurable Surfaces vs. Decode-and-Forward: What is the Impact of Electromagnetic Interference?
This paper considers the use of an intelligent reconfigurable surface (I...
research
∙
03/02/2022
Cell-Free Massive MIMO-OFDM for High-Speed Train Communications
Cell-free (CF) massive multiple-input multiple-output (MIMO) systems sho...
research
∙
02/21/2022
Massive MIMO with Dual-Polarized Antennas
This paper considers a single-cell massive MIMO (multiple-input multiple...
research
∙
02/18/2022
Cell-Free Massive MIMO in Virtualized CRAN: How to Minimize the Total Network Power?
Previous works on cell-free massive MIMO mostly consider physical-layer ...
research
∙
02/17/2022
Quantisation-aware Precoding for MU-MIMO with Limited-capacity Fronthaul
Base stations in 5G and beyond use advanced antenna systems (AASs), wher...
research
∙
02/17/2022
mmWave Communications for Indoor Dense Spaces: Ray-Tracing Based Channel Characterization and Performance Comparison
In this paper, the indoor dense space (IDS) channel at 28 GHz is charact...
research
∙
12/31/2021
NOMA Versus Massive MIMO in Rayleigh Fading
This paper compares the sum rates and rate regions achieved by power-dom...
research
∙
12/31/2021
Human and Machine Type Communications can Coexist in Uplink Massive MIMO Systems
Future cellular networks are expected to support new communication parad...
research
∙
12/31/2021
Centralized and Distributed Power Allocation for Max-Min Fairness in Cell-Free Massive MIMO
Cell-free Massive MIMO systems consist of a large number of geographical...
research
∙
12/31/2021
MRT-based Joint Unicast and Multigroup Multicast Transmission in Massive MIMO Systems
We study joint unicast and multigroup multicast transmission in single-c...
research
∙
11/30/2021
Distributed Computation of A Posteriori Bit Likelihood Ratios in Cell-Free Massive MIMO
This paper presents a novel strategy to decentralize the soft detection ...
research
∙
11/30/2021
Clustering-Based Activity Detection Algorithms for Grant-Free Random Access in Cell-Free Massive MIMO
Future wireless networks need to support massive machine type communicat...
research
∙
11/30/2021
RadioWeaves for Extreme Spatial Multiplexing in Indoor Environments
With the advances in virtual and augmented reality, gaming applications,...
research
∙
10/13/2021
A Primer on Near-Field Beamforming for Arrays and Reconfigurable Intelligent Surfaces
Wireless communication systems have almost exclusively operated in the f...
research
∙
10/12/2021
Uplink Performance of Cell-Free Massive MIMO Over Spatially Correlated Rician Fading Channels
We consider a practical cell-free massive multiple-input-multiple-output...
research
∙
09/08/2021
RIS-Assisted Massive MIMO with Multi-Specular Spatially Correlated Fading
Reconfigurable intelligent surfaces (RISs) have attracted great attentio...
research
∙
09/07/2021
Learning-Based Downlink Power Allocation in Cell-Free Massive MIMO Systems
This paper considers a cell-free massive multiple-input multiple-output ...
research
∙
09/06/2021
Learning to Perform Downlink Channel Estimation in Massive MIMO Systems
We study downlink (DL) channel estimation in a multi-cell Massive multip...
research
∙
08/28/2021
Scalable Cell-Free Massive MIMO Systems: Impact of Hardware Impairments
Standard cell-free (CF) multiple-input-multiple-output (mMIMO) systems i...
research
∙
08/18/2021
Toward Autonomous Reconfigurable Intelligent Surfaces Through Wireless Energy Harvesting
In this work, we examine the potential of autonomous operation of a reco...
research
∙
08/10/2021
Channel Modeling and Channel Estimation for Holographic Massive MIMO with Planar Arrays
In a realistic wireless environment, the multi-antenna channel usually e...
research
∙
08/05/2021
Foundations of User-Centric Cell-Free Massive MIMO
Imagine a coverage area where each mobile device is communicating with a...
research
∙
06/30/2021
Pilot Assignment for Joint Uplink-Downlink Spectral Efficiency Enhancement in Massive MIMO Systems with Spatial Correlation
This paper proposes a flexible pilot assignment method to jointly optimi...
research
∙
06/21/2021
Electromagnetic Interference in RIS-Aided Communications
The prospects of using a reconfigurable intelligent surface (RIS) to aid...
research
∙
06/17/2021
Is Channel Estimation Necessary to Select Phase-Shifts for RIS-Assisted Massive MIMO?
Reconfigurable intelligent surfaces (RISs) have attracted great attentio...
research
∙
06/08/2021
Optimizing a Binary Intelligent Reflecting Surface for OFDM Communications under Mutual Coupling
An intelligent reflecting surface (IRS) can greatly improve the channel ...
research
∙
05/21/2021