240 citations · 866 across the 44 of their papers we have counts for
37 papers · 1 filter
Achievable Rate of a STAR-RIS Assisted Massive MIMO System Under Spatially-Correlated Channels
Anastasios Papazafeiropoulos, Le-Nam Tran, Zaid Abdullah +2
Reconfigurable intelligent surfaces (RIS)-assisted massive multiple-input multiple-output (mMIMO) is a promising technology for applications in next-generation networks. However, r…
Optimization of RIS-aided SISO Systems Based on a Mutually Coupled Loaded Wire Dipole Model
Nemanja Stefan Perović, Le-Nam Tran, Marco Di Renzo +1
The electromagnetic (EM) features of reconfigurable intelligent surfaces (RISs) fundamentally determine their operating principles and performance. Motivated by these consideration…
Variational Bayes Inference for Data Detection in Cell-Free Massive MIMO
Ly V. Nguyen, Hien Quoc Ngo, Le-Nam Tran +2
Cell-free massive MIMO is a promising technology for beyond-5G networks. Through the deployment of many cooperating access points (AP), the technology can significantly enhance use…
On the Achievable Rate of IRS-Assisted Multigroup Multicast Systems
Muhammad Farooq, Vaibhav Kumar, Markku Juntti +1
Intelligent reflecting surfaces (IRSs) have shown huge advantages in many potential use cases and thus have been considered a promising candidate for next-generation wireless syste…
Energy Efficiency Maximization in Large-Scale Cell-Free Massive MIMO: A Projected Gradient Approach
Trang C. Mai, Hien Quoc Ngo, Le-Nam Tran
This paper considers the fundamental power allocation problem in cell-free massive mutiple-input and multiple-output (MIMO) systems which aims at maximizing the total energy effici…
Achievable Rate Maximization for Underlay Spectrum Sharing MIMO System with Intelligent Reflecting Surface
Vaibhav Kumar, Mark Flanagan, Rui Zhang +1
In this letter, the achievable rate maximization problem is considered for intelligent reflecting surface (IRS) assisted multiple-input multiple-output (MIMO) systems in an underla…
On the Maximum Achievable Sum-rate of the RIS-aided MIMO Broadcast Channel
Nemanja Stefan Perović, Le-Nam Tran, Marco Di Renzo +1
Reconfigurable intelligent surfaces (RISs) represent a new technology that can shape the radio wave propagation and thus offers a great variety of possible performance and implemen…
A Max-Min Task Offloading Algorithm for Mobile Edge Computing Using Non-Orthogonal Multiple Access
Vaibhav Kumar, Muhammad Fainan Hanif, Markku Juntti +1
To mitigate computational power gap between the network core and edges, mobile edge computing (MEC) is poised to play a fundamental role in future generations of wireless networks.…
Secrecy Rate Maximization for Intelligent Reflecting Surface Assisted MIMOME Wiretap Channels
Anshu Mukherjee, Vaibhav Kumar, Le-Nam Tran
Intelligent reflecting surface (IRS) has gained tremendous attention recently as a disruptive technology for beyond 5G networks. In this paper, we consider the problem of secrecy r…
On the Secrecy Rate under Statistical QoS Provisioning for RIS-Assisted MISO Wiretap Channel
Vaibhav Kumar, Mark F. Flanagan, Derrick Wing Kwan Ng +1
Reconfigurable intelligent surface (RIS) assisted radio is considered as an enabling technology with great potential for the sixth-generation (6G) wireless communications standard.…
On the Optimality of the Stationary Solution of Secrecy Rate Maximization for MIMO Wiretap Channel
Anshu Mukherjee, Vaibhav Kumar, Eduard Jorswieck +2
To achieve perfect secrecy in a multiple-input multiple-output (MIMO) Gaussian wiretap channel (WTC), we need to find its secrecy capacity and optimal signaling, which involves sol…
On the Secrecy Rate of Downlink NOMA in Underlay Spectrum Sharing with Imperfect CSI
Vaibhav Kumar, Mark F. Flanagan, Daniel Benevides da Costa +1
In this paper, we present the ergodic sum secrecy rate (ESSR) analysis of an underlay spectrum sharing non-orthogonal multiple access (NOMA) system. We consider the scenario where…
On the Achievable Sum-rate of the RIS-aided MIMO Broadcast Channel
Nemanja Stefan Perović, Le-Nam Tran, Marco Di Renzo +1
Reconfigurable intelligent surfaces (RISs) represent a new technology that can shape the radio wave propagation and thus offers a great variety of possible performance and implemen…
Efficient Numerical Methods for Secrecy Capacity of Gaussian MIMO Wiretap Channel
Anshu Mukherjee, Björn Ottersten, Le Nam Tran
This paper presents two different low-complexity methods for obtaining the secrecy capacity of multiple-input multiple-output (MIMO) wiretap channel subject to a sum power constrai…
On the Secrecy Capacity of MIMO Wiretap Channels: Convex Reformulation and Efficient Numerical Methods
Anshu Mukherjee, Björn Ottersten, Le-Nam Tran
This paper presents novel numerical approaches to finding the secrecy capacity of the multiple-input multiple-output (MIMO) wiretap channel subject to multiple linear transmit cova…
Optimization of RIS-aided MIMO Systems via the Cutoff Rate
Nemanja Stefan Perović, Le-Nam Tran, Marco Di Renzo +1
The main difficulty concerning optimizing the mutual information (MI) in reconfigurable intelligent surface (RIS)-aided communication systems with discrete signaling is the inabili…
Achievable Rate Optimization for MIMO Systems with Reconfigurable Intelligent Surfaces
Nemanja Stefan Perović, Le-Nam Tran, Marco Di Renzo +1
Reconfigurable intelligent surfaces (RISs) represent a radical new technology that can shape the radio wave propagation in wireless communication systems and offers a great variety…
Noncoherent Joint Transmission Beamforming for Dense Small Cell Networks: Global Optimality, Efficient Solution and Distributed Implementation
Quang-Doanh Vu, Le-Nam Tran, Markku Juntti
We investigate the coordinated multi-point noncoherent joint transmission (JT) in dense small cell networks. The goal is to design beamforming vectors for macro cell and small cell…
On Estimating Maximum Sum Rate of MIMO Systems with Successive Zero-Forcing Dirty Paper Coding and Per-antenna Power Constraint
Thuy M. Pham, Ronan Farrell, Le-Nam Tran
In this paper, we study the sum rate maximization for successive zero-forcing dirty-paper coding (SZFDPC) with per-antenna power constraint (PAPC). Although SZFDPC is a low-complex…
Energy Efficiency Fairness for Multi-Pair Wireless-Powered Relaying Systems
Kien-Giang Nguyen, Quang-Doanh Vu, Le-Nam Tran +1
We consider a multi-pair amplify-and-forward relay network where the energy-constrained relays adopting time-switching protocol harvest energy from the radio frequency signals tran…
Energy Efficiency Maximization for C-RANs: Discrete Monotonic Optimization, Penalty, and l0-Approximation Methods
Kien-Giang Nguyen, Quang-Doanh Vu, Markku Juntti +1
We study downlink of multiantenna cloud radio access networks (C-RANs) with finite-capacity fronthaul links. The aim is to propose joint designs of beamforming and remote radio hea…
Energy-Efficient Multi-Cell Multigroup Multicasting with Joint Beamforming and Antenna Selection
Oskari Tervo, Le-Nam Tran, Harri Pennanen +3
This paper studies the energy efficiency and sum rate trade-off for coordinated beamforming in multi-cell multi-user multigroup multicast multiple-input single-output systems. We f…
Energy-Efficient Transmission Strategies for CoMP Downlink - Overview, Extension, and Numerical Comparison
Kien-Giang Nguyen, Oskari Tervo, Quang-Doanh Vu +2
This paper focuses on energy-efficient coordinated multi-point (CoMP) downlink in multi-antenna multi-cell wireless communications systems. We provide an overview of transmit beamf…
Alternating Optimization for Capacity Region of Gaussian MIMO Broadcast Channels with Per-antenna Power Constraint
Thuy M. Pham, Ronan Farrell, Le-Nam Tran
This paper characterizes the capacity region of Gaussian MIMO broadcast channels (BCs) with per-antenna power constraint (PAPC). While the capacity region of MIMO BCs with a sum po…