100 citations · 492 across the 30 of their papers we have counts for
31 papers
Movable Access Points in Visible Light Communications: Opportunities, Challenges and Future Directions
Sylvester Aboagye, Telex M. N. Ngatched
Visible light communication (VLC) is expected to be a key component of future wireless networks due to its abundant license-free spectrum, inherent high-level security, and the alr…
Max-Min Secrecy Rate and Secrecy Energy Efficiency Optimization for RIS-Aided VLC Systems: RSMA Versus NOMA
Omar Maraqa, Sylvester Aboagye, Majid H. Khoshafa +1
Integrating VLC with the RIS significantly enhances physical layer security by enabling precise directional signal control and dynamic adaptation to the communication environment.…
Secrecy Performance of a Keyhole-based Multi-user System with Multiple Eavesdroppers
Parwez Alam, Ankit Dubey, Jules M. Moualeu +2
This paper investigates the secrecy performance of a keyhole-aided multi-user communication network in the presence of multiple eavesdroppers. The communication happens through the…
RIS-Assisted Physical Layer Security in Emerging RF and Optical Wireless Communication Systems: A Comprehensive Survey
Majid H. Khoshafa, Omar Maraqa, Jules M. Moualeu +5
Physical layer security (PLS) has received a growing interest from the research community for its ability to safeguard data confidentiality without relying on key distribution or e…
Optical STAR-RIS-Aided VLC Systems: RSMA Versus NOMA
Omar Maraqa, Sylvester Aboagye, Telex M. N. Ngatched
A critical concern within the realm of visible light communications (VLC) pertains to enhancing system data rate, particularly in scenarios where the direct line-of-sight (LoS) con…
Liquid Crystal-Based RIS for VLC Transmitters: Performance Analysis, Challenges, and Opportunities
Sylvester Aboagye, Telex M. N. Ngatched, Alain R. Ndjiongue +2
This article presents a novel approach of using reconfigurable intelligent surfaces (RISs) in the transmitter of indoor visible light communication (VLC) systems to enhance data ra…
Optimized Design of Joint Mirror Array and Liquid Crystal-Based RIS-Aided VLC systems
Omar Maraqa, Telex M. N. Ngatched
Most studies of reflecting intelligent surfaces (RISs)-assisted visible light communication (VLC) systems have focused on the integration of RISs in the channel to combat the line-…
RIS-Aided Physical Layer Security Improvement in Underlay Cognitive Radio Networks
Majid H. Khoshafa, Telex M. N. Ngatchede, Mohamed H. Ahmed
In this paper, a reconfigurable intelligent surface (RIS)-aided underlay cognitive radio network is investigated. An RIS is utilized to improve the secondary network (SN) reliabili…
Deep Reinforcement Learning for RIS-Assisted FD Systems: Single or Distributed RIS?
Alice Faisal, Ibrahim Al-Nahhal, Octavia A. Dobre +1
This paper investigates reconfigurable intelligent surface (RIS)-assisted full-duplex multiple-input single-output wireless system, where the beamforming and RIS phase shifts are o…
RIS-Assisted Visible Light Communication Systems: A Tutorial
Sylvester Aboagye, Alain R. Ndjiongue, Telex M. N. Ngatched +2
Recent development of the fifth-generation (5G) of cellular networks has led to their deployment worldwide. As part of the implementation, one of the challenges that must be addres…
Double-Sided Beamforming in OWC Systems Using Omni-Digital Reconfigurable Intelligent Surfaces
Alain R. Ndjiongue, Telex M. N. Ngatched, Octavia A. Dobre +1
In this paper, we introduce a variant of reconfigurable intelligent surfaces (RISs) called omni-digital-RISs (DRISs), which allow multiple physical processes, with application to o…
Digital RIS (DRIS): The Future of Digital Beam Management in RIS-Assisted OWC Systems
Alain R. Ndjiongue, Telex M. N. Ngatched, Octavia A. Dobre +1
Reconfigurable intelligent surfaces (RIS) have been recently introduced to optical wireless communication (OWC) networks to resolve skip areas and improve the signal-to-noise ratio…
Reconfigurable Intelligent Surface Optimization for Uplink Sparse Code Multiple Access
Ibrahim Al-Nahhal, Octavia A. Dobre, Ertugrul Basar +2
The reconfigurable intelligent surface (RIS)-assisted sparse code multiple access (RIS-SCMA) is an attractive scheme for future wireless networks. In this letter, for the first tim…
Deep Reinforcement Learning for Optimizing RIS-Assisted HD-FD Wireless Systems
Alice Faisal, Ibrahim Al-Nahhal, Octavia A. Dobre +1
This letter investigates the reconfigurable intelligent surface (RIS)-assisted multiple-input single-output (MISO) wireless system, where both half-duplex (HD) and full-duplex (FD)…
Design of a Power Amplifying-RIS for Free-Space Optical Communication Systems
Alain R. Ndjiongue, Telex M. N. Ngatched, Octavia A. Dobre +1
The steering dynamics of re-configurable intelligent surfaces (RIS) have hoisted them to the front row of technologies that can be exploited to solve skip-zones in wireless communi…
Incremental Relaying for Power Line Communication: Performance Analysis and Power Allocation
Ankit Dubey, Chinmoy Kundu, Telex M. N. Ngatched +2
In this paper, incremental decode-and-forward (IDF) and incremental selective decode-and-forward (ISDF) relaying are proposed to improve the spectral efficiency of power line commu…
Performance Analysis of RIS-Based nT-FSO Link Over G-G Turbulence With Pointing Errors
Alain R. Ndjiongue, Telex M. N. Ngatched, Octavia A. Dobre +2
One of the main problems faced by communication systems is the presence of skip-zones in the targeted areas. With the deployment of the fifth-generation mobile network, solutions a…
Re-configurable Intelligent Surface-based VLC Receivers Using Tunable Liquid-crystals: The Concept
Alain R. Ndjiongue, Telex M. N. Ngatched, Octavia A. Dobre +1
Visible light communication (VLC) enables access to huge unlicensed bandwidth, a higher security level, and no radio frequency interference. With these advantages, VLC emerges as a…
Towards the Use of Re-configurable Intelligent Surfaces in VLC Systems: Beam Steering
Alain R. Ndjiongue, Telex M. N. Ngatched, Octavia A. Dobre +1
The emergence of visible light communication (VLC) technology as a solution to solve radio frequency impediments, such as spectrum shortage, is continuously appealing. In addition…
Bender's Decomposition for Optimization Design Problems in Communication Networks
Ahmed Ibrahim, Octavia A. Dobre, Telex M. N. Ngatched +1
Various types of communication networks are constantly emerging to improve the connectivity services and facilitate the interconnection of various types of devices. This involves t…
VLC-Based Networking: Feasibility and Challenges
Alain R. Ndjiongue, Telex M. N. Ngatched, Octavia A. Dobre +1
Visible-light communication (VLC) has emerged as a prominent technology to address the radio spectrum shortage. It is characterized by the unlicensed and unexploited high bandwidth…
Time Reversal based MAC for Multi-Hop Underwater Acoustic Networks
Ruiqin Zhao, Hao Long, Octavia A. Dobre +3
Constrained-energy underwater acoustic nodes are typically connected via a multi-hop underwater acoustic network (MHUAN) to cover a broad marine region. Recently, protocols for eff…
Secrecy performance of dual-hop threshold relaying system with diversity reception
C. Kundu, T. M. N. Ngatched, O. A. Dobre
In this paper, the secrecy of a cooperative system consisting of a single source, relay, destination and eavesdropper is analyzed. The threshold-selection decode-and-forward relay…
Relay Selection to Improve Secrecy in Cooperative Threshold Decode-and-Forward Relaying
C. Kundu, T. M. N. Ngatched, O. A. Dobre
In this paper, relay selection is considered to enhance security of a cooperative system with multiple threshold-selection decode-and-forward (DF) relays. Threshold-selection DF re…